found it:
error thrown by b4a 13:
Error in c:\android\tools\..\extras\b4a_local\unpacked-core-runtime-2.2.0-63853454841490\jars\classes.zip:classes.dex:
Type androidx.arch.core.executor.ArchTaskExecutor$$ExternalSyntheticLambda0 is defined multiple times: c:\android\tools\..\extras\b4a_local\unpacked-core-runtime-2.2.0-63853454841490\jars\classes.zip:classes.dex, c:\android\tools\..\extras\b4a_remote\androidx\arch\core\core-runtime\2.2.0\unpacked-core-runtime-2.2.0\jars\classes.zip:classes.dex
Compilation failed
this compiler option: #AdditionalJar: core-runtime-2.2.0.aar was necessary previously. i think it had to do with the recent mlkit barcode scanning or text recognition
modules for b4a 12.8. apparently now included in b4a 13. remove the #AdditionalJar option for core-runtime-2.2.0.aar, and all's good
error thrown by b4a 13:
Error in c:\android\tools\..\extras\b4a_local\unpacked-core-runtime-2.2.0-63853454841490\jars\classes.zip:classes.dex:
Type androidx.arch.core.executor.ArchTaskExecutor$$ExternalSyntheticLambda0 is defined multiple times: c:\android\tools\..\extras\b4a_local\unpacked-core-runtime-2.2.0-63853454841490\jars\classes.zip:classes.dex, c:\android\tools\..\extras\b4a_remote\androidx\arch\core\core-runtime\2.2.0\unpacked-core-runtime-2.2.0\jars\classes.zip:classes.dex
Compilation failed
this compiler option: #AdditionalJar: core-runtime-2.2.0.aar was necessary previously. i think it had to do with the recent mlkit barcode scanning or text recognition
modules for b4a 12.8. apparently now included in b4a 13. remove the #AdditionalJar option for core-runtime-2.2.0.aar, and all's good
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