Solidworks PDM error pop up saying Could not open database 'Company Vault'!  

This pop up is happening for 3 of my Solidworks users. Currently running Solidworks 2018 Professional, and use PDM Standard. This pop up happens and you can't get rid of it...although, it doesn't seem to keep anyone from being able to use the database. So it is more of an annoyance then anything. 

Does anyone know of a solution for this? Any direction would be much appreciated.