I filled a PDF form in Acrobat and when I click Save I get "The document could not be saved. There was a problem reading this document (14)". I have 40 minutes of work in there. What can I do?

Do not close the window yet. Try these in order.

1. Use File > Save As and save under a new name in a different folder, like the Desktop.
2. If that fails, print to PDF. Choose File > Print, select Adobe PDF or Microsoft Print to PDF as the printer and save. This keeps your typed answers but flattens the form fields.
3. Close other programs that may have the file open, and check that the original is not read-only or on a network drive that went offline.
4. In Acrobat go to File > Save As Other > Optimized PDF and save a copy.

The error usually means something is wrong in the PDF structure, so saving a new copy gets around it. Update Acrobat as well, because older builds show this more often.

Print to PDF saved all my answers. Thank you, you saved my afternoon.