The error message is telling you all. You just need to use the package name of your own. A package name is a identitiy of a application.
To rename your package name, In eclipse just right click on a project in project explorer. Then go to Android Tools > rename a Aplication Package name. Then enter a new package name.
Also make sure that you are trying to upload your release build
In the Android Studio after renaming a Package then go to "build.gradle (Module:App)
And change below line
to the following line
Just replace a "tanxe" with a word you want or the Organization name i.e.
the new package name and rebuild your project.
Write something else other than a com.example
For example: com.newname etc will do(make sure that only your name/firm name)
I hope above given solutions will help you in resolving your all the required errors.