Question: Error, invalid input: rhs received {f[0](eta) = -(1/50)*eta^2+(1/5)*eta+1/5, theta[0](eta) = -eta+5}, which is not valid for its 1st argument, expr

Good morning sirs,

I have been trying to compute this problem to its given me the error message "Error, invalid input: rhs received {f[0](eta) = -(1/50)*eta^2+(1/5)*eta+1/5, theta[0](eta) = -eta+5}, which is not valid for its 1st argument, expr".

The problem is attach below.

Please, anyone with useful informations should help.

Thanks

HPM_4.mw

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