The letter means your insurance company notified the DMV that your insurance coverage ended, and that no other company notified the DMV about new coverage.
But what if I do have insurance?
Then you should follow the instructions in the letter and contact your company or agent about the problem. Ask your company to file a notice of coverage with the DMV electronically.
All that trouble, even though I am insured. But no can do. Any pointers on what I shouldn't do in my situation?