[pstricks] Help

[wono at math.itb.ac.id]

Dear all

I just take the code from Pstricks example about vector field. It is
running well if I compiled alone, or directly from the source. But if I
put in beamer style tex doesn't work. It is said that there is variable
error, but I can't find the file.

I included the file and also log file

Thank you

Regards

Wono
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