Answers.Body: <blockquote>
    <p>Problem 1 - The requested package am-impact/amnav could not be found in any version, there may be a typo in the package name.</p>
  </blockquote>
  
  <p><code>am-impact/amnav isn't a valid Craft 3 plugin, so you need to move that reference from your</code>composer.json` file. You can see the full list of Craft 3 plugins here: <a href="https://plugins.craftcms.com/" rel="nofollow noreferrer">https://plugins.craftcms.com/</a></p>
  
  <blockquote>
    <p>symfony/intl v3.3.7 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.27-1~dotdeb+8.1)...</p>
  </blockquote>
  
  <p>All of those usually happen when you run a <code>composer update/install</code> on environment A that has higher library versions than environment B and you deploy the <code>composer.lock</code> file to environment B and try to run <code>composer update</code> again.</p>
  
  <p>You can force Composer to use a "lowest common denominator" across all environments like so: <a href="https://github.com/pixelandtonic/craftcom/blob/develop/composer.json#L31-L33" rel="nofollow noreferrer">https://github.com/pixelandtonic/craftcom/blob/develop/composer.json#L31-L33</a></p>
  
  <blockquote>
    <p>Installation request for roave/security-advisories dev-master#3df94834c80037130b533703df4672785b6ea112 -> satisfiable by roave/security-advisories[dev-master]. - newism/craft3-fields 0.0.10 requires symfony/intl ^3.3</p>
  </blockquote>
  
  <p>You can either remove <code>roave/security-advisories</code> from your <code>composer.json</code> file, remove <code>newism/craft3-fields</code> from it or wait for the author of the <code>craft3-fields</code> plugin to bump their symfony dependencies to a higher version that doesn't trigger <code>roave/security-advisories</code>.</p>
  
  <p>Note that after making changes to your <code>composer.json</code>, you'll need to run <code>composer update</code> from terminal from your project's root.</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2018-03-06T19:43:45.647Z
Answers.LastActivityDate: 2018-03-06T19:43:45.647Z
Answers.UserDisplayName: Brad Bell
Body: <p>I've been running an installation Craft CMS 3.0.0-RC13 for some time with no problems. However, now I cannot install new plugins nor can I remove any that are currently installed. I keep getting the same (or similar) error. The full response is included below. </p>
  
  <p>I've tried</p>
  
  <pre><code>composer remove [package]
  
  composer clear-cache
  
  composer update 
  </code></pre>
  
  <p>Almost seems like Composer has been corrupted or something. I'm assuming that the information about "php version does not satisfy..." is related to the bad package because I didn't alter anything about my php configuration.</p>
  
  <p><a href="https://i.sstatic.net/yqhxn.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/yqhxn.png" alt="Screenshot of the persistent error message"></a></p>
  
  <blockquote>
    <p>Composer was unable to install the updates.</p>
    
    <p>Error: An error occurred</p>
    
    <p>Output: Loading composer repositories with package information
    Updating dependencies Your requirements could not be resolved to an
    installable set of packages.</p>
    
    <p>Problem 1
    - The requested package am-impact/amnav could not be found in any version, there may be a typo in the package name. Problem 2
    - symfony/intl v3.3.7 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.27-1~dotdeb+8.1) overridden by "config.platform.php" version
    (7.0) does not satisfy that requirement.
    - symfony/intl v3.3.8 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.27-1~dotdeb+8.1) overridden by "config.platform.php" version
    (7.0) does not satisfy that requirement.
    - symfony/intl v3.3.9 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.27-1~dotdeb+8.1) overridden by "config.platform.php" version
    (7.0) does not satisfy that requirement.
    - symfony/intl v3.4.0 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.27-1~dotdeb+8.1) overridden by "config.platform.php" version
    (7.0) does not satisfy that requirement.
    - symfony/intl v3.3.10 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.27-1~dotdeb+8.1) overridden by "config.platform.php" version
    (7.0) does not satisfy that requirement.
    - symfony/intl v3.3.11 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.27-1~dotdeb+8.1) overridden by "config.platform.php" version
    (7.0) does not satisfy that requirement.
    - symfony/intl v3.3.12 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.27-1~dotdeb+8.1) overridden by "config.platform.php" version
    (7.0) does not satisfy that requirement.
    - symfony/intl v3.3.13 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.27-1~dotdeb+8.1) overridden by "config.platform.php" version
    (7.0) does not satisfy that requirement.
    - symfony/intl v3.3.14 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.27-1~dotdeb+8.1) overridden by "config.platform.php" version
    (7.0) does not satisfy that requirement.
    - symfony/intl v3.4.1 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.27-1~dotdeb+8.1) overridden by "config.platform.php" version
    (7.0) does not satisfy that requirement.
    - symfony/intl v3.4.2 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.27-1~dotdeb+8.1) overridden by "config.platform.php" version
    (7.0) does not satisfy that requirement.
    - symfony/intl v3.4.3 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.27-1~dotdeb+8.1) overridden by "config.platform.php" version
    (7.0) does not satisfy that requirement.
    - symfony/intl v3.3.15 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.27-1~dotdeb+8.1) overridden by "config.platform.php" version
    (7.0) does not satisfy that requirement.
    - symfony/intl v3.4.4 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.27-1~dotdeb+8.1) overridden by "config.platform.php" version
    (7.0) does not satisfy that requirement.
    - symfony/intl v3.3.16 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.27-1~dotdeb+8.1) overridden by "config.platform.php" version
    (7.0) does not satisfy that requirement.
    - symfony/intl v3.4.5 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.27-1~dotdeb+8.1) overridden by "config.platform.php" version
    (7.0) does not satisfy that requirement.
    - Installation request for roave/security-advisories dev-master#3df94834c80037130b533703df4672785b6ea112 -> satisfiable by
    roave/security-advisories[dev-master].
    - newism/craft3-fields 0.0.10 requires symfony/intl ^3.3 -> satisfiable by symfony/intl[v3.4.5, v3.3.16, v3.4.4, v3.3.15, v3.4.3,
    v3.4.2, v3.4.1, v3.3.14, v3.3.13, v3.3.12, v3.3.11, v3.3.10, v3.4.0,
    v3.3.9, v3.3.8, v3.3.7, v3.3.6, v3.3.5, v3.3.4, v3.3.3, v3.3.2,
    v3.3.1, v3.3.0].
    - symfony/intl v3.3.6 conflicts with roave/security-advisories[dev-master].
    - symfony/intl v3.3.5 conflicts with roave/security-advisories[dev-master].
    - symfony/intl v3.3.4 conflicts with roave/security-advisories[dev-master].
    - symfony/intl v3.3.3 conflicts with roave/security-advisories[dev-master].
    - symfony/intl v3.3.2 conflicts with roave/security-advisories[dev-master].
    - symfony/intl v3.3.1 conflicts with roave/security-advisories[dev-master].
    - symfony/intl v3.3.0 conflicts with roave/security-advisories[dev-master].
    - Installation request for newism/craft3-fields ^0.0.10 -> satisfiable by newism/craft3-fields[0.0.10].</p>
    
    <p>Potential causes:
    - A typo in the package name
    - The package is not available in a stable-enough version according to your minimum-stability setting see for more details.
    - It's a private package and you forgot to add a custom repository to find it</p>
    
    <p>Read for further common problems. Running update with --no-dev does
    not mean require-dev is ignored, it just means the packages will not
    be installed. If dev requirements are blocking the update you have to
    resolve those problems.</p>
  </blockquote>
  
Tags: <plugins><craft3><error><composer>
Title: How To Fix "Error: Composer was unable to install the updates."
ThreadText: # How To Fix "Error: Composer was unable to install the updates."
  
  (Asked by: username_0 on 2018-03-06)
  
  I've been running an installation Craft CMS 3.0.0-RC13 for some time with no problems. However, now I cannot install new plugins nor can I remove any that are currently installed. I keep getting the same (or similar) error. The full response is included below.
  
  I've tried
  
  ```
  composer remove [package]
  
  composer clear-cache
  
  composer update 
  
  ```
  
  Almost seems like Composer has been corrupted or something. I'm assuming that the information about "php version does not satisfy..." is related to the bad package because I didn't alter anything about my php configuration.
  
  [![Screenshot of the persistent error message](https://i.sstatic.net/yqhxn.png)](https://i.sstatic.net/yqhxn.png)
  
  > Composer was unable to install the updates.
  >
  > Error: An error occurred
  >
  > Output: Loading composer repositories with package information
  > Updating dependencies Your requirements could not be resolved to an
  > installable set of packages.
  >
  > Problem 1
  > - The requested package am-impact/amnav could not be found in any version, there may be a typo in the package name. Problem 2
  > - symfony/intl v3.3.7 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.27-1~dotdeb+8.1) overridden by "config.platform.php" version
  > (7.0) does not satisfy that requirement.
  > - symfony/intl v3.3.8 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.27-1~dotdeb+8.1) overridden by "config.platform.php" version
  > (7.0) does not satisfy that requirement.
  > - symfony/intl v3.3.9 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.27-1~dotdeb+8.1) overridden by "config.platform.php" version
  > (7.0) does not satisfy that requirement.
  > - symfony/intl v3.4.0 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.27-1~dotdeb+8.1) overridden by "config.platform.php" version
  > (7.0) does not satisfy that requirement.
  > - symfony/intl v3.3.10 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.27-1~dotdeb+8.1) overridden by "config.platform.php" version
  > (7.0) does not satisfy that requirement.
  > - symfony/intl v3.3.11 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.27-1~dotdeb+8.1) overridden by "config.platform.php" version
  > (7.0) does not satisfy that requirement.
  > - symfony/intl v3.3.12 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.27-1~dotdeb+8.1) overridden by "config.platform.php" version
  > (7.0) does not satisfy that requirement.
  > - symfony/intl v3.3.13 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.27-1~dotdeb+8.1) overridden by "config.platform.php" version
  > (7.0) does not satisfy that requirement.
  > - symfony/intl v3.3.14 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.27-1~dotdeb+8.1) overridden by "config.platform.php" version
  > (7.0) does not satisfy that requirement.
  > - symfony/intl v3.4.1 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.27-1~dotdeb+8.1) overridden by "config.platform.php" version
  > (7.0) does not satisfy that requirement.
  > - symfony/intl v3.4.2 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.27-1~dotdeb+8.1) overridden by "config.platform.php" version
  > (7.0) does not satisfy that requirement.
  > - symfony/intl v3.4.3 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.27-1~dotdeb+8.1) overridden by "config.platform.php" version
  > (7.0) does not satisfy that requirement.
  > - symfony/intl v3.3.15 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.27-1~dotdeb+8.1) overridden by "config.platform.php" version
  > (7.0) does not satisfy that requirement.
  > - symfony/intl v3.4.4 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.27-1~dotdeb+8.1) overridden by "config.platform.php" version
  > (7.0) does not satisfy that requirement.
  > - symfony/intl v3.3.16 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.27-1~dotdeb+8.1) overridden by "config.platform.php" version
  > (7.0) does not satisfy that requirement.
  > - symfony/intl v3.4.5 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.27-1~dotdeb+8.1) overridden by "config.platform.php" version
  > (7.0) does not satisfy that requirement.
  > - Installation request for roave/security-advisories dev-master#3df94834c80037130b533703df4672785b6ea112 -> satisfiable by
  > roave/security-advisories[dev-master].
  > - newism/craft3-fields 0.0.10 requires symfony/intl ^3.3 -> satisfiable by symfony/intl[v3.4.5, v3.3.16, v3.4.4, v3.3.15, v3.4.3,
  > v3.4.2, v3.4.1, v3.3.14, v3.3.13, v3.3.12, v3.3.11, v3.3.10, v3.4.0,
  > v3.3.9, v3.3.8, v3.3.7, v3.3.6, v3.3.5, v3.3.4, v3.3.3, v3.3.2,
  > v3.3.1, v3.3.0].
  > - symfony/intl v3.3.6 conflicts with roave/security-advisories[dev-master].
  > - symfony/intl v3.3.5 conflicts with roave/security-advisories[dev-master].
  > - symfony/intl v3.3.4 conflicts with roave/security-advisories[dev-master].
  > - symfony/intl v3.3.3 conflicts with roave/security-advisories[dev-master].
  > - symfony/intl v3.3.2 conflicts with roave/security-advisories[dev-master].
  > - symfony/intl v3.3.1 conflicts with roave/security-advisories[dev-master].
  > - symfony/intl v3.3.0 conflicts with roave/security-advisories[dev-master].
  > - Installation request for newism/craft3-fields ^0.0.10 -> satisfiable by newism/craft3-fields[0.0.10].
  >
  > Potential causes:
  > - A typo in the package name
  > - The package is not available in a stable-enough version according to your minimum-stability setting see for more details.
  > - It's a private package and you forgot to add a custom repository to find it
  >
  > Read for further common problems. Running update with --no-dev does
  > not mean require-dev is ignored, it just means the packages will not
  > be installed. If dev requirements are blocking the update you have to
  > resolve those problems.
  
  **Tags:** plugins, craft3, error, composer
  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_1 on 2018-03-06. Score: 1
  
  > Problem 1 - The requested package am-impact/amnav could not be found in any version, there may be a typo in the package name.
  
  `am-impact/amnav isn't a valid Craft 3 plugin, so you need to move that reference from your`composer.json` file. You can see the full list of Craft 3 plugins here: <https://plugins.craftcms.com/>
  
  > symfony/intl v3.3.7 requires php ^5.5.9|>=7.0.8 -> your PHP version (7.0.27-1~dotdeb+8.1)...
  
  All of those usually happen when you run a `composer update/install` on environment A that has higher library versions than environment B and you deploy the `composer.lock` file to environment B and try to run `composer update` again.
  
  You can force Composer to use a "lowest common denominator" across all environments like so: <https://github.com/pixelandtonic/craftcom/blob/develop/composer.json#L31-L33>
  
  > Installation request for roave/security-advisories dev-master#3df94834c80037130b533703df4672785b6ea112 -> satisfiable by roave/security-advisories[dev-master]. - newism/craft3-fields 0.0.10 requires symfony/intl ^3.3
  
  You can either remove `roave/security-advisories` from your `composer.json` file, remove `newism/craft3-fields` from it or wait for the author of the `craft3-fields` plugin to bump their symfony dependencies to a higher version that doesn't trigger `roave/security-advisories`.
  
  Note that after making changes to your `composer.json`, you'll need to run `composer update` from terminal from your project's root.
  
  
  ---
  
  