Firstly I would remove the trailing space from the project filename.
Secondly I would remove the square brackets from your path. It's generally not good practice to have brackets and other such characters in file and folder names as they can be inadvertently used as wildcards in application code. I appreciate your whole production is already inside this path so you may not want to change it, but it's worth checking.
What happens if you hit yes and open the correct .prproj?
@DrewPost For this kind of case you can use the Edit > Reassociate Source Clips command. The command can reassociate as many clips as you select to a single project. So select your clips, run the command, and point it to the project in your production that has those Source clips.
Alternatively if that project no longer exists and so there is no longer a Source clip anywhere in the production, you can use the Edit > Genrate Source Clips for Media command. This breaks any link across project and drops a new copy of the Source clip in your current project.