Error (297009): Can't open project -- you do not have permission to write to all the files or create new files in the project's

Description

Due to a problem in the Quartus® Prime Standard and Pro Edition Software version 17.0 and earlier you may see the error message mentioned above happened intermittently if you attempt to compile multiple designs in the same directory.

Resolution

To work around the problem, go to

Assigment -> settings -> Compilation Process Settings -> select Maximum Processors allow = 1

This problem is fixed starting with the Quartus® Prime Standard and Pro Edition Software version 17.1.