I had the same issue on a mac as well.
- Open your /Users/macuser/ folder
- Press CMD + SHIFT + . (dot/period) to view hidden folders
- DELETE .gradle folder
- Restart Android Studio
This will cause Android Studio to rebuild and re-download your .gradle folder fixing your corrupt files in the process.
NOTE* I’m looking for experienced programmers to let us know if this is safe / correct to do so! It worked for me with no errors but i’m new to this so a second opinion would be appreciated.