Outlook Task problem - "parameter values not valid"

O

Onedar

How do I correct this problem? When I try to save a new task, I get an error
message: "Could not complete operation. One or more parameter values are not
valid." What does this mean and how do I correct it? Never had a problem
before - just started happening. I don't recall changing any settings and
nothing looks unusual in the task I am attempting to save.
 
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