Answers.Body: <p>I performed a manual upgrade as documented at <a href="https://docs.craftcms.com/v2/updating.html#manually-updating" rel="nofollow noreferrer">https://docs.craftcms.com/v2/updating.html#manually-updating</a> and the error automagically disappeared. Therefore, it looks like there was a glitch in the One-click Updating in this particular case.</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2018-06-08T22:01:44.313Z
Answers.Text: That's super weird...
Answers.UserDisplayName: Brad Bell
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2018-06-08T17:55:40.830Z
Answers.LastActivityDate: 2018-06-08T17:55:40.830Z
Answers.UserDisplayName: Andrea DeMers
Body: <p>Just updated Craft 2.6.3002 to 2.6.3017 and am getting the following error in the CP &amp; front-end: <code>Call to undefined function Craft\mb_convertOcase()</code> <code>/craft/app/helpers/StringHelper.php(558)</code>. On line 558 of this file, I have <code>return mb_convert_case($string, MB_CASE_UPPER, static::UTF8);</code>. Where is <code>O</code> coming from?</p>
  
  <p>Screenshot of error &amp; stack trace: <a href="https://i.sstatic.net/GqZkh.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/GqZkh.png" alt="Screenshot of error &amp; stack trace"></a></p>
  
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2018-06-08T17:25:20.313Z
Comments.Text: It is correct in their git. Copy the line https://github.com/craftcms/cms/blob/develop-v2/src/helpers/StringHelper.php#L558 or download the entire Craft folder and you should be fine. Bug reports don't belong here, please contact pixel and tonic directly if there are other issues
Comments.UserDisplayName: Robin Schambach
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2018-06-08T17:39:26.440Z
Comments.Text: As I mentioned above, line 558 in my StringHelper.php file is correct. Also, how am I supposed to necessarily know ahead of time is something is indeed a bug?
Comments.UserDisplayName: Andrea DeMers
Tags: <updating><updates>
Title: Error: Call to undefined function Craft\mb_convertOcase() after updating to 2.6.3017
ThreadText: # Error: Call to undefined function Craft\mb_convertOcase() after updating to 2.6.3017
  
  (Asked by: username_0 on 2018-06-08)
  
  Just updated Craft 2.6.3002 to 2.6.3017 and am getting the following error in the CP & front-end: `Call to undefined function Craft\mb_convertOcase()` `/craft/app/helpers/StringHelper.php(558)`. On line 558 of this file, I have `return mb_convert_case($string, MB_CASE_UPPER, static::UTF8);`. Where is `O` coming from?
  
  Screenshot of error & stack trace: [![Screenshot of error & stack trace](https://i.sstatic.net/GqZkh.png)](https://i.sstatic.net/GqZkh.png)
  
  **Tags:** updating, updates
  
  > **Comments:**
  > **username_1**: It is correct in their git. Copy the line https://github.com/craftcms/cms/blob/develop-v2/src/helpers/StringHelper.php#L558 or download the entire Craft folder and you should be fine. Bug reports don't belong here, please contact pixel and tonic directly if there are other issues  
  > **username_0**: As I mentioned above, line 558 in my StringHelper.php file is correct. Also, how am I supposed to necessarily know ahead of time is something is indeed a bug?  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_0 on 2018-06-08. Score: 1 | Accepted answer
  
  I performed a manual upgrade as documented at <https://docs.craftcms.com/v2/updating.html#manually-updating> and the error automagically disappeared. Therefore, it looks like there was a glitch in the One-click Updating in this particular case.
  
  > **Comments:**
  > **username_2**: That's super weird...  
  
  ---
  
  