<p dir="auto">when i tried to use this. FirebaseAuth.instance.signInWithEmailAndPassword(email:credEmail,password:credPassword);<br>
the result is :</p>
<p dir="auto"><code class="notranslate">/AndroidRuntime(13937): java.lang.NullPointerException: null value in entry: uid=null E/AndroidRuntime(13937): 	at com.google.common.collect.CollectPreconditions.checkEntryNotNull(CollectPreconditions.java:34) E/AndroidRuntime(13937): 	at com.google.common.collect.ImmutableMapEntry.&lt;init&gt;(ImmutableMapEntry.java:49) E/AndroidRuntime(13937): 	at com.google.common.collect.ImmutableMap.entryOf(ImmutableMap.java:122) E/AndroidRuntime(13937): 	at com.google.common.collect.ImmutableMap$Builder.put(ImmutableMap.java:198) E/AndroidRuntime(13937): 	at io.flutter.plugins.firebaseauth.FirebaseAuthPlugin.userInfoToMap(FirebaseAuthPlugin.java:422) E/AndroidRuntime(13937): 	at io.flutter.plugins.firebaseauth.FirebaseAuthPlugin.mapFromUser(FirebaseAuthPlugin.java:440) E/AndroidRuntime(13937): 	at io.flutter.plugins.firebaseauth.FirebaseAuthPlugin.access$000(FirebaseAuthPlugin.java:25) E/AndroidRuntime(13937): 	at io.flutter.plugins.firebaseauth.FirebaseAuthPlugin$SignInCompleteListener.onComplete(FirebaseAuthPlugin.java:375) E/AndroidRuntime(13937): 	at com.google.android.gms.tasks.zzj.run(Unknown Source) E/AndroidRuntime(13937): 	at android.os.Handler.handleCallback(Handler.java:754) E/AndroidRuntime(13937): 	at android.os.Handler.dispatchMessage(Handler.java:95) E/AndroidRuntime(13937): 	at android.os.Looper.loop(Looper.java:163) E/AndroidRuntime(13937): 	at android.app.ActivityThread.main(ActivityThread.java:6379) E/AndroidRuntime(13937): 	at java.lang.reflect.Method.invoke(Native Method) E/AndroidRuntime(13937): 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904) E/AndroidRuntime(13937): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:794)</code></p>
<p dir="auto">and then my the debug apps is stopped working.<br>
i try it from folder example on github, For google and faceebook signin is working well. except for this.<br>
is it a bugs or i miss something from that ?</p>
<p dir="auto">Thank you for your attention :)</p>
<h2 dir="auto">Steps to Reproduce</h2>
<p dir="auto">I'm using the 'master' branch.</p>
<p dir="auto">Ran these commands:<br>
$ flutter create demoApp<br>
$ cd demoApp<br>
$ flutter build apk</p>
<h2 dir="auto">Flutter Doctor</h2>
<p dir="auto">Paste the output of running <code class="notranslate">flutter doctor</code> here.</p>
<p dir="auto">[✓] Flutter (on Linux, channel master)<br>
• Flutter at /usr/local/google/home/quddusc/flutter<br>
• Framework revision <a class="commit-link" data-hovercard-type="commit" data-hovercard-url="https://github.com/flutter/flutter/commit/2f642ce9083c3354b985d956bd57145d2006bc79/hovercard" href="https://github.com/flutter/flutter/commit/2f642ce9083c3354b985d956bd57145d2006bc79"><tt>2f642ce</tt></a> (85 minutes ago), engine revision <a class="commit-link" data-hovercard-type="commit" data-hovercard-url="https://github.com/flutter/flutter/commit/57edc534d69031b03409e7af37cbc492cb135086/hovercard" href="https://github.com/flutter/flutter/commit/57edc534d69031b03409e7af37cbc492cb135086"><tt>57edc53</tt></a></p>
<p dir="auto">[✓] Android toolchain - develop for Android devices (Android SDK 24.0.0-preview)<br>
• Android SDK at /usr/local/google/home/quddusc/Android/Sdk<br>
• Platform android-N, build-tools 24.0.0-preview<br>
• OpenJDK Runtime Environment (IcedTea 2.6.6) (7u101-2.6.6-0ubuntu0.14.04.1)</p>
<p dir="auto">[✓] Atom - a lightweight development environment for Flutter<br>
• Atom installed; Flutter plugin version 0.2.2</p>
<h2 dir="auto">Logs and Crash Reports</h2>
<p dir="auto">Please attach any relevent logs or crash reports.</p>
<p dir="auto">Building APK in debug mode (android-arm)...<br>
Exception in thread "main" java.lang.UnsupportedClassVersionError: com/android/dx/command/Main : Unsupported major.minor version 52.0<br>
at java.lang.ClassLoader.defineClass1(Native Method)<br>
at java.lang.ClassLoader.defineClass(ClassLoader.java:803)<br>
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)<br>
at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)<br>
at java.net.URLClassLoader.access$100(URLClassLoader.java:71)<br>
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)<br>
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)<br>
at java.security.AccessController.doPrivileged(Native Method)<br>
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)<br>
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)<br>
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)<br>
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)<br>
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:482)</p>
<p dir="auto">Oops; flutter has exited unexpectedly: "Exit code 1 from: /usr/local/google/home/quddusc/Android/Sdk/build-tools/24.0.0-preview/dx --dex --force-jumbo --output /tmp/flutter_toolsb75eKg/classes.dex /usr/local/google/home/quddusc/flutter/bin/cache/artifacts/engine/android-arm/classes.dex.jar".</p>