proguard problem after updating to android gradle plugin 3.5

Question

I save the json presentation of some objects as cache in my app. I had no problem after updating each release of the app and json objects was corre

Answer 1

I also got the same error.

And I found that it's an error of enabledR8 which is used to reduce app size.

and It is true predefined. So by set value, a false error was gone.

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Set it value false of r8 in gradle.properties file.

android.enableR8=false