PowerBI Reportserver: An error occured while attempting to save the report to PowerBI Report Server

[Conco1234]

I worked on a PowerBI file which was saved on the reportserver using the normal powerBI desktop. When I start the file, I get the following message:

however, when I want to upload it back to the report server it gives an error:

Anybody have any experience with this issue? Any method to fix this instead of rebuilding it from the lastest version?

thank you for your time! 

[d_gosbell]

I've detailed the issue here Power BI Report Server – fixing “Can’t upload this report” – Random Procrastination (gosbell.com) along with all the possible fixes I know of.