Did you try saving it with a different shorter name? Try to save it with a simple name and to somewhere else like to the Desktop. Do you get any error codes? Here’s one I found
<a rel="nofollow" target="_blank" href="
https://ttlc.intuit.com/questions/1899721-error-131-there-was-an-error-in-saving-your-file-when-savi...>
