I extracted the source files of OpenComputers into /src/api/java/, and put its normal mod file into /eclipse/mods/. I runned the client, but crashed.
fml-client-latest.log
Edit: When I use Gradle (gradlew runClient), the game starts corectly, with another mod that I added, but OC isn't loaded.
Edit 2: Ok, I moved the mod from /eclipse/mods/ to /run/mods/ and it launched fine, but, when I create a new world, the game freeze. Here's the crash-report: crash-2017-04-11_16.13.33-server.txt