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Question: indeterminate or coefficient outside base

Question:indeterminate or coefficient outside base

goraya 5 Maple
base field diffalg
June 03 2019
1

Hi I have encounted this error:

Error, (in diffalg/DAparse_polynomial) unknown indeterminate or coefficient outside base field, -Cp+Cf/(1+Kw*(-sigma*`ΔPi`+`ΔP`)*(1-(1/2)*Fp/Ff)/Ks)

The text highlighted in bold is an equation that I typed in.

 

Can I know what it means?
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