Premiere Pro: "This project contained a sequence that could not be opened..."

10:30am

I need to do a quick fix on a short film, I'm launching Premiere to work on the cut, I duplicated the Project file first to work on a new increment.

Adobe flashes a window asking of I want to use the 7 days Demo mode, or if I want to sign-in??? I do sign-in. Premiere then takes a good 3+min. to launch, loading all the components.

Finally it's up, I open my duplicated Project and... Premiere starts with an error:

"This project contained a sequence that could not be opened. No sequence preview preset file or codec could be associated with this sequence type."

Lovely. Don't we all need this level of stress added to our everyday professional life?

Looking for the problem, I find this page:
https://helpx.adobe.com/premiere-pro/kb/features-presets-missing-premiere-pro.html

Oh boy... I don't want to spend three hours troubleshooting this damn app. My blood pressure is raising.

I will take it one baby step at a time, I'll quit Premiere and relaunch as starter.

Premiere takes another 3+min. to launch.

I open the Project, and... Yeah! This time it loads just fine. I duplicate my Cut19 Sequence, rename it Cut20, and off I go.

10:45am

So if you get that error message, before jumping the gun and going into full-on troubleshooting mode, just quit and start Premiere again.

Pfff...