Question: Error, (in plot) type `has_unit` does not exist

Hi there,

 

I'm using Maple 13.02 on Windows 7 64-bit.

I get the error message Error, (in plot) type `has_unit` does not exist every time I try to make a plot.

Example:

plot(x^2,x=-1..1) gives this error.

 

Dou you know what's wrong?

 

Have a nice day!

H.C., Denmark.

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