Cannot open my score

Just edited my score and when I open the score again, it says the file is corrupted and the details are :"Error=XML_ERROR_EMPTY_DOCUMENT ErrorID=13 (0xd) Line number=0". The "Open anyway" option doesn't work either - it displays nothing. It was as if my score disappeared with no reason. I only wanted to change the title of my score and this happened. What shall I do? Is there a way to fix my score? More details can be offered if needed.