I had the same thing occur this morning on my TRX-2. I believe that error message refers to the Memory card in the radio. I had checked for updates the day before. My cure was to delete everything on the SD card and then reprogram the card. I did leave the card in the radio. It is working fine now.
I was hesitant to respond after reading so many non helpful and unfriendly posts as it relates to the Uniden SDS100. I hope that helps.