The general contract of toString is that it returns a string that "textually represents" this object. The idea is to provide a concise but informative representation that will be useful to a person ...
org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':proguard'. at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter ...
Fatal error: java.lang.NullPointerException at java.base/java.util.concurrent.ConcurrentHashMap.putVal(ConcurrentHashMap.java:1011) at java.base/java.util.concurrent ...