I have a Gradle file which, whenever I load open it in IntelliJ IDEA 14.1.5, shows IDE errors for the entire file. Namely all the errors seem to be either:
java.
What I found is that this warning is from Groovy inspection of the Intelliji. So if your project is not pure groovy, you can disable this inspection by going to File -> settings -> Editor -> Inspections -> disable Groovy. Again, just a workaround.
Try File | Invalidate Caches and restart. It worked for me after i mess the syntaxe somewhere else in the file.