In my case this was caused by errors in a .jar file included my library. The .jar file was one I created and so I was able to fix it. Here is a breakdown of how the problem started and how I fixed it:
- I made changes to another project(not the project that failed to install)
- Exported to a .jar included ALL files in project(which was the mistake)
- the resulting .jar replaced the one already included in my project
- Errors occurred
to fix it:
- Re-exported .jar file including only the src folder
- re-built and installed just fine.
Having included all the files that were not part of the src folder caused a few duplicates in the project and .jar:
- Example: multiple androidmanifest.xml files one local and one inside .jar
This caused the .apk to be invalid. Hope this helps someone. NOTE: this solution will only work if you have library files that you have changed and compiled yourself and have made the same mistake as I did when I included folders that were not needed.
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