Question: Get Error in "DGsetup([t, r, theta, phi], M1, verbose)"

Hi, I am learning GR and new to maple. I played with maple's DifferentialGeometry package.

While duplicated the maple GR example, in DGsetup([t, r, theta, phi], M1, verbose),

I got the error,

DGsetup([t, r, theta, phi], M1, verbose)

The following coordinates have been protected:
[t, r, theta, phi]


The following vector fields have been defined and protected:


Error, (in Typeset:-Tdisplay[true]) `alias` does not evaluate to a module

 

 I don't know how to fix it. Can anyone kindly help?

Thanks

 

 

 

 

 

 

 

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