Flutter || Common Errors

 1. How to Fix Android License Status Unknown In Flutter? 

Users can give a try to below things in a command prompt.

flutter doctor --android-licenses

and type Y when needed to accept the licenses.

Note : Try to run as administrator

 Step: #1

 If it is throwing some exceptions like 

java.lang.NoClassDefFoundError: javax/xml/bind/annotation/XmlSchema etc.

It means your java is not installed or not the correct version. move to the next step.

 Step: #1  JAVA 8.1 and JAVA_HOME path.

Install JAVA 8.1 and set the JAVA_HOME path. Make sure it is version 8.1 register a free account and download from oracle the 8.1 version, remember above 11+ won’t work for flutter

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2. How to Solve No Connected Devices in Flutter?

<ANDROID_SDK_HOME>\platform-tools>adb devices

List of devices attached

4df798d76f98cf6d        unauthorized

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Restart ADB Server:

adb kill-server

adb start-server

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3. Dart DevTools?

Dart DevTools exited with code 1. Resolving dependencies... + args 1.6.0 + async 2.4.2 + browser_launcher 0.1.7 + charcode 1.1.3 + collection 1.14.13 + convert 2.1.1 + crypto 2.1.5 + devtools 0.9.3+4 + devtools_server 0.9.3+4 + devtools_shared 0.9.3+4 + http 0.12.2 + http_multi_server 2.2.0 + http_parser 3.1.4 + intl 0.16.1 + logging 0.11.4 + meta 1.2.3 + mime 0.9.7 + path 1.7.0 + pedantic 1.9.2 + shelf 0.7.9 + shelf_proxy 0.1.0+7 + shelf_static 0.2.8 + source_span 1.7.0 + sse 3.5.0 + stack_trace 1.9.5 + stream_channel 2.0.0 + string_scanner 1.0.5 + term_glyph 1.1.0 + typed_data 1.2.0 + usage 3.4.2 + uuid 2.2.2 + vm_service 5.2.0 + webkit_inspection_protocol 0.7.3 Downloading devtools 0.9.3+4... Failed to rename directory because access was denied. This may be caused by a virus scanner or having a file in the directory open in another application.

Solutions

So, please try running this from your terminal

flutter pub global activate devtools

Note : Try to run as administrator

Flutter/bin/cache/dart-sdk/bin/pub global activate devtools

in Mycase - 

C:\Users\sapan\Downloads\flutter_windows_1.22.2-stable\flutter\bin\cache\dart-sdk\bin>pub global activate devtools

https://pub.dev/packages/devtools/install

pub global activate devtools

Type chrome => http://127.0.0.1:9100/

Connecting to VM Service at