Photoshop refused to save file that was really important for tutorial.

[UnderDogNowOnTop]

Is there some sort of error log file I can go and check why? 

I know now that I maybe shouldn't make projects 1920 x 10000 , I don't know where the error log is. And it wouldn't let me recover the project in autorecover, no name of it . nothing. Wouldn't let me save to cloud either. But that's the first time I ever seen I wasn't able to save anything on PSD, i should of used Save for Web. 

I'm f*c&in bummed out that cold chill of desperation and hopeless comes over my body... I have a project due for a company, and really wanted this done. I can't now 

[Derek Cross]

Which version of Photoshop and OS?
How much RAM and spare disk capacity do you have?

Does this happen on most files or just this one?

Have you tried resetting the Photoshop preferences, which you can do under the General tab in Photoshop preferences?

(The size you mention wouldn't cause problems. When you work on a file for a long time it is important to save regularly and keep a copy externally.)