Question: Error, (in Engine:-Dispatch) invalid subscript selector

Hi everyone,

I'm trying to solve the following equation and unfortunately I get this error ( Error, (in Engine:-Dispatch) invalid subscript selector ) each time I try. Could you please help me??

I will be thankful for your great help.

solve(m*exp(-(m-1)*tij)*d2-θ+θ*tij-θ*(Σ(tkj, k = 1 .. c))-m*η*(1-exp(-tij))(m-1) = 0, tij)

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