- Plesk 11.x for Windows
Cannot install license key:
PLESK_ERROR: Error: unknown error
Attempt to upload key in a zip file also fails with the error:
PLESK_ERROR: Error: Uploaded file is invalid: An unknown file upload error occurred
When attempting to restart IIS, it fails.
No space left on the disk.
- Free the disk space or increase partition size.
- Install the license again.