After Upgrading To The New Android Studio I Have Been Having Error

It gives this build error for any project: Please find the picture attached below Cause: aidl is missing from 'C:\Users\onyeb\AppData\Local\Android\Sdk\build-tools\27.0.3\aidl.e

Solution 1:

I had the same problem after upgrading Android Studio to 3.1.2. The file aidl was somehow missing the ".exe" file extension. Directory 27.0.3 had 177 files and 30 folders.

I solved it manually deleting folder sdk\build-tools\27.0.3 and re-downloading it directly from Android Studio. I didn't even have to restart.