Hi There all,
It is generally the simplest answers that most overlook, my wonderful wife S3 GT-I9300 Galaxy Phone had the same issue as most, most instantly think the card isn't blank WTF is going on, the answer is in the second half of this message, unsupported file IN THE system, she had installed an unsupported EPUB book without the reader App on her phone, she converted the epub to pdf which worked for her, but she had left the epub version of the file on the SDCARD, i used an explorer like FILE EXPERT and found the epub and deleted it.
Then removed the unsupported file and the Notice disappeared after restart.
Mint, Wife happy, which naturally falls over to myself being happy.
tragedy avoided, yay!! peace all!