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In a general sense, the authors of the Gradle plugins tries their best to give sensible error message. In this case, the Android team gives to the users a sensible error message which says “Failed to find Build Tools revision 29.0.2”. In those cases, we can’t be of more help then echo the error message which is the Build Tools version 29.0.2 wasn’t found. Meaning, you need to install the Build Tools version 29.0.2. I suggest looking at the Android documentation to find out how that can be done. It’s an environment/configuration issue not a Gradle specific issue. Given Dart language is used, you may need to refer to which ever framework you may be using that in turn use the Android Gradle plugin.

Thanks so much. I'll try these...