Hi Aldin! Have you experienced this problem before, or has anyone else using the server had this issue? Also, are you using the Tableau Desktop 9.1 version, as this could simply be a compatibility issue?
Let me know how it goes!
There could be a lot of reasons that causes it. One possible thing i would check is if the Tableau server is running properly. Are you able to open other workbooks? if so, then you need to check if you have the right permission to publish in the project.
Also do a check to see if all the tableau process are running fine.