Error Messages While Saving

[ben]

I could tell Revit was getting tired because she started to run slow and began to get fidgety. I thought it would be best to save & sync. When I clicked save I had a full page white screen pop up that just said, "A required source is unavailable." in red letters in the top left corner. I didn't think to screenshot it because I thought, "Here we go, she's gonna crash." I closed the window then an error message popped up that said the exact same thing.

I clicked close fully expecting her to go down, then another error message popped up right when I clicked close.

I clicked close on this one too thinking she was going to crash like the crane Big Blue (https://www.youtube.com/watch?v=HI-ENqgjQXM), but nothing happened. Right after that I saved & synced no problem. Did I just get lucky? What do these error messages typically mean?

[Anonymous]

I think both of those usually indicate a network drop at the moment of sync.  The missing resource was probably your server and the improper argument was probably the bit of code directing your local machine to save to that server.  Before you close your local file check the file size of the central model - sometimes those network errors will kill your model stone dead.  The error message you'll get if that happens is "Incorrect Schema".

[ben]

109MB. Some of these error messages I have to look up the definition to try and figure out what the words even mean.