A problem occurred evaluating project ‘:app‘. > path may not be null or empty string. path=‘null‘
出现如上报错，
If you downloaded the app from github, it is possible that signing configs are note adapted. Try like this to comment code on android/app/build.gradle :
注释掉android/app/build.gradle文件中的以下内容，
参考：
原文：https://www.cnblogs.com/sea-stream/p/12174192.html