That means, that somewhere in the code of the view that is being opened there is LotusScript- Code, that tries to call the "allDocuments"- Property of an object. "AllDocuments" usually is a member of NotesDatabase- Class. But maybe a developer mixed it up with the "AllEntries"- Property of the NotesView- Class. Or the NotesDatabase- Object is defined as Variant and not assigned yet (timing issue)...
Whatever: This is a selfmade error... Ask the developer of the app or find out yourself:
You need to use the designer- client to examine the view that should be opened for any LotusScript found there or use the Debugger to find out the faulting code.