Can't open an appointment in Calendar - Help!

V

vanilla beach

I have searched this forum and have tried clearing the cache as suggested.
However, the problem isnt resolved. When I try to add a new appointment it
says "the form required to view this message can not be displayed". Or when I
try to open an existing one it says "the custom form could not be opened".

Please help. I use my Calendar religiously! Thanks!
 
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