Android Studio - 'Cannot resolve symbol' syntax highlighting errors although build is ok

Question

I have a really annoying problem since several days, after I tried to restore a previously working Android Studio project from a backup, after getting a new computer.

Answer 1

The reason is because I had a '!' symbol in my project path. Apparently, as I learnt now, many Java programs fail due to this reason! :-)

I just renamed the path and it works fine now :-)

---

P.S.

Thank you @gabriele-mariotti for the gradlew clean suggestion. In fact, that helped me find the real root cause. I was not able to run gradlew from the terminal due to a RuntimeException:

Could not determine wrapper version. at org.gradle.wrapper.GradleWrapperMain.wrapperVersion

But that helped me learn about the effect of '!' symbol on paths, and to the root cause of the problem. Thank you all!