Conversion to Dalvik format failed: Unable to execute dex:, dalvikdex

Conversion to Dalvik format failed: Unable to execute dex:, dalvikdex

This error is caused by the addition of unnecessary core library or repeated addition of the same library jar package. (There are related jar packages under lib in the project, and external libraries are introduced)

Delete the reference to the library, Clean the project, re-run one project, and OK.

I have also tried it before. I added more Android. jar and reported an error. just remove the unused package. I have made android. jar a User Library separately, and used add extenerl jar.

So it is wrong. If you delete the redundant android. jar file, it will be OK.