This message started popping suddenly after my Access front-end for a SQL Server 2005 backend database got too big. Apparently this is activated when the number of objects (tables/forms/reports etc) exceeds some mystery threshold. You won't be able to do ANYTHING. As always, there are many solutions depending on what actually caused this generic message.
The one that worked for me - nicely I might add - was DECOMPILE.
<path to file> /decompile
This has to be done from the command prompt (Press Start and enter cmd and press enter). If the file or folders in the path contain spaces, enclose the <path to file> in quotes.