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improve error message when gradlew assembledebug is used with -Pdart-defines that are not base64 encoded #95116
Description
I propose a better error message when -Pdart-defines are not base64 encoded.
With Flutter 2.5 the following message is output:
"Error parsing assemble command: your generated configuration may be out of date. Try re-running 'flutter build ios' or the appropriate build command."
This message didn't help. Only a search for the message in the flutter_tools source revealed the true cause of the problem:
A message containing a hint about the required base64 encoding would be more helpful for many developers using integration tests with CI. They will probably use -Pdart-defines to add some parameters for their tests.
Steps to Reproduce
- in android folder of any project
- run ./gradlew app:assembleDebug -Pdart-defines=MY_ENV=whatever
Logs
./gradlew app:assembleDebug -Pdart-defines=MY_ENV=whatever
...
Task :app:compileFlutterBuildDebug FAILED
Error parsing assemble command: your generated configuration may be out of date. Try re-running 'flutter build ios' or the appropriate build command.
A gradlew task with correct base64 encoded dart-defines build without problem.
The issue is just the misleading error message.
./gradlew app:assembleDebug -Pdart-defines=TVlfRU5WPXdoYXRldmVy
...
BUILD SUCCESSFUL in 15s
Activity
darshankawar commentedon Dec 13, 2021
christopherfujino commentedon Jan 28, 2022
@schilken is there a reason you are directly calling
gradlew app:assembleDebugrather than calling it via the flutter tool?schilken commentedon Jan 28, 2022
@christopherfujino We build the apks to deploy them into perfecto, our test service provider, as it is described here for the Firebase Test Lab:
https://github.com/flutter/flutter/tree/master/packages/integration_test#firebase-test-lab
christopherfujino commentedon Jan 28, 2022
Ahh, I see, that seems a reasonable use case :)
Improve error message when `dart-define` content are not `base64 enco…
Improve error message when `dart-define` content are not `base64 enco…
github-actions commentedon Apr 15, 2026
This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of
flutter doctor -vand a minimal reproduction of the issue.