This can happen if your SD card is (nearly) full, as it needs some space on the card to do the route planning calculations (longer routes = more calculation). Check to see how much free space you have.when planning long routes getting "error during planning" messege.
You have to call Tomtom support....Your map is "history" !!!Same thing happened to me two months ago.I called them and they put a new one in my account...
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