how i can use next subset in summation(sum(k, c(j,k) * lambda((t+1),j,k)) =e= sum(k, (c(j,k)-g(j,k)))
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 const(t,j).. sum(k, c(j,k) * lambda((t+1),j,k)) =e= sum(k, (c(j,k)-g(j,k))
****                                      $145$148,8,37,409

  8  ')' expected
 37  '=l=' or '=e=' or '=g=' operator expected
145  Set identifier or quoted element expected
148  Dimension different - The symbol is referenced with more/less
        indices as declared
409  Unrecognizable item - skip to find a new statement
       looking for a ';' or a key word to get started again

how can i fix these code part?
