What worked for me was simply navigating to the project via finder and double clicking on the .xcworkspace file. Opening via XCode's "open" menu did not work. I had also signed out of all of my accounts but I don't think that was what did it, because I still can't open the project via XCode's open menu or start menu shortcuts.
cfogelklou
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Just to clear it up, my solution was to go to the "Library Search Paths" under the test target build settings and delete the whole line except for "$(inherited)"