Topic category: Help with MCreator software
Hope this helps, but here's what you gotta do.
Pylo > [Your Mcreator version] > Forge > .gradle > 2.7 > taskArtifacts
When you find the cache.properties.lock, rename it to cache.properties.
Make sure to include the last . on the end
It will install a new cache.properties.lock version when you launch up, but the new version will not be corrupted as this one is and you needed the new cache.properties anyways.
Hope this helps, if you are still crashing message me with your error code I will TRY and help you.