Excel Solver - The problem is too large for Solver to handle (8).

This message appears when Solver determines that your model is too large for the Solving method you have selected.  All Solving methods are limited to 200 decision variables; the GRG Nonlinear and Evolutionary Solving methods are also limited to 100 constraints in addition to lower and upper bounds on the variables.  For more information, see Algorithms and methods used by Solver.