You're running the database directly on the server? Normally the front-end is distributed to reach user and placed on their local PC and run there.
Regardless, the first thing is do is compile the database directly on the server to ensure everything is okay on that front and that all the references are valid.
Daniel Pineault, 2010-2019 Microsoft MVP
Professional Support: http://www.cardaconsultants.com
MS Access Tips and Code Samples: http://www.devhut.net