"Object reference not set to an instance of an object"

Multiple attempts to save screen recordings. Kept getting an error. Either it would shut down storyline entirely or not be saved after it had said it was saved, or the recordings were there, so carried on.

Ran out of "disc space" because it was recommended to save everything to the C drive. These files are huge and I have a ton of them. Had to get an external hard drive.  Not as much of an issue with the new drive. But very worried about corruption.

Now I am getting the "Object reference not set to an instance of an object" error when saving to the file on the external hard drive that I JUST opened it from. Attempting to save it to C drive since it is cleared out, but it seems frozen. But of course I will lose 5 hours of work if I task manage it closed because saving takes soooo long I would get nothing done if I saved after every edit. This thread is over 7 years old. I hope something is being done to fix this.