Is that file location synced to the cloud or a remote server? That is the most common cause of this exception - the sync somehow interferes with SketchUp’s save process. Reportedly some varieties of anti-virus and anti-malware can also cause it.
Not sure about the locations, but it appears to have saved the most recent version.
It is well documented that saving to a place other than a local drive will cause file corruption and the loos of your time. Save to a local drive then send it to its final resting place. Download the file then open it from the local drive when you want to access it.