How can I correct Error 71 in GAMS program?

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Priyavrat Thareja

need to define Error 71.

Kindly search in FAQ's/ instructions etc.

Iman Rahimi

Actually this is the definition:

"The symbol shown has been declared as an equation ,but no symbolic equation (..) was found.hint-look for commas in the documentation text for the equation.use quotes around the text or eliminate the commas"

I have revise several times my codes but I can not understand this error.

the mathematical characters used in an equation do not need a comma . Probably there is a full stop that has guised as a comma. Did you put a comma somewhere?

further look for quotes / in pairs?

Hope it helps