Getting error when creating appt. in a supervisor's calendar

One of my users has received this error:
Err -> Object Variable not set [91] Query Save.
when she tried to create an appointment in a supervisor's calendar. I've checked permissions and it looks ok. Both users use Lotus Notes 5.0.8. Could you help me?
This will occur if the name of the user is not appropriately entered in delegation. Make sure they are listed in the field "Allow only the following people to create and edit entries in my calendar," which is found in the Author and Editor access section of the Calendar delegation tab.

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This was first published in March 2004