Cause

You have attempted to delete named colors from the document which are being used.

What Can I Do?

image\BULLET.gif Clicking Delete Unused deletes all the colors you have selected apart from those currently in use.

image\BULLET.gif If you click Delete All, all the colors you have selected will be deleted, including the ones being used. The objects which are using these colors will have local colors applied to them. The appearance of the document does not change.