I continue to get this message when loading an assembly, "Referenced document has non-matching internal ID"

Can you tell me how to get around this?  I load the assembly and am show this error message.  I locate the file position it with in the assembly an then save and close the assembly.  When I open the assembly again, I get the same error message.  This problem re-occurs when ever I load the assembly.  Is there a fix?

SolidworksAssemblies