I am also having the same/similar issue. I was able to export 2 videos a couple of months ago that was about an hour in length and they exported just fine. Now, I've tried 3 different smaller files no longer than 5 minutes in length and they don't export and give the same error every time. I've read multiple articles and have restarted my computer, uninstalled and reinstalled Premiere Rush, closed and reopened the file, and change the location of where I'm trying to save it on the computer same exact error every time. Other articles talk about space, it shows I have 291 gb free on my computer out of 476 gb and it is a new computer as of November 2019. I bought this one to handle adobe applications. I have a Dell Inspiron 7791 Intel Core i7-10510U CPU @ 1.80GHz with 16 gb of installed ram operating on Windows 10.