Question: Problem with Maple 15 at startup

Hey you guys!

 

When I open up maple 15, a few lines saying the following appears:

 

Error, (in with) Arccos is not a command in the grader package
Error, (in with) Arccos is not a command in the grader package
Error, (in with) Arccos is not a command in the grader package
Error, (in with) Arccos is not a command in the grader package
Error, (in with) user level initialization for package `plots' failed: Arccos is not a command in the grader package
>

 

I am not allowed to do any math either:

 

> 5+5;
Error, Got internal error in Typesetting:-Parse : "Arccos is not a command in the grader package"
                                                       (5 + 5, )

Can anyone of you tell me what the problem is?

 

Joakim

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