Failed to install library: Servo:1.2.0.
Error: 3 INVALID_ARGUMENT: The library Servo has multiple installations:
- C:\Users<username>\Documents\Arduino\libraries\Servo
- C:\Users<username>\Documents\Arduino\libraries\Servo
Automatic library install can't be performed in this case, please manually remove all duplicates and retry.
I checked and there is only 1 "C:\Users<username>\Documents\Arduino\libraries\Servo" folder. The contents of that flder looks OK to me.
IDE = 2.1.0.