[gradsusr] error for variable

[wendi harjupa]

Dear Grads user

I need help..

I got these messages when I am running grads..

Error reading 11200 bytes at location 26868800
Data Request Error:  Error for variable 'pp'
  Error ocurred at column 1
DISPLAY error:  Invalid expression
  Expression = pp

What should I care about those messages??

Thank you very much.

Best regards,
wendi
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