Intellij compile failures: “is already defined as”

Question

I\'ve got a scala project that compiles, runs and tests fine when using SBT from the command line. However, when building the project in intellij, it seems every class in the pr

Answer 1

In my case, the problem was the protobuf Idea plugin:

1. Remove the idea protbuf plugin.
2. Close Idea
3. Remove all folders related with idea (.idea and .idea_modules)
4. Open Idea and Import the project again.