Error: An error has occurred in your program...(due to clicking Close).

Error:

An error has occurred in your program. To keep working anyway, click 'Ignore' and save your work in a new file. To quit this program, click 'Close'.

Cause:

Clicking 'Close' displays the following error message:
This program has performed an illegal operation and will be shut down. If the program persists, contact the program vendor.
Clicking 'Close' terminates the program.

Solution:

Edit only one color during a Microsoft Paint session.