A duplicate mod Waila appeared when I want to dependent EnderIO in ForgeGradle for my EnderIO addon.

Here are the crash log.
fml-client-latest.txt

And that is what minecraft will be...

It seems you build env is ignoring this: https://github.com/SleepyTrousers/EnderIO/blob/master/build.gradle#L70

I also recommend to depend on Ender IO with transitive = false and adding the runtime dependencies to your gradle. Those are far less than our compile dependencies (only endercore).

Thank you very much!They are all useful suggestions.