Problem description

Running an old open source project, compiles the following error.

java.io.IOException: Invalid keystore format
Execution failed for task ':app:transformDexWithInstantRunDependenciesApkForDebug'.
> com.android.build.api.transform.TransformException: com.android.ide.common.signing.KeytoolException: Failed to read key AndroidDebugKey from store "C:\Users\a do\.android\debug.keystore": Invalide keystore format

Solution

According to the error message, there is a problem with the debug signature format.

We only need to open the c drive, in the current user’s directory, there is a .android directory, delete the debug.keystore inside.

If it prompts that the process is occupied, exit Android Studio first. Then delete it again.

Finally re-running the project, will automatically generate debug.keystore.

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