cst solver not running through matlab

hi every1
i have been trying to run cst solver through matlab, but it just wont work nor it shows any error. the following code is being used:
Solver=invoke(mws,'Solver');
Solver.invoke('Method','Hexahedral');
Solver.invoke('CalculationType','TD-S');
Solver.invoke('StimulationPort','All');
Solver.invoke('StimulationMode','All');
Solver.invoke('SteadyStateLimit','-30.0');
Solver.invoke('MeshAdaption','False');
Solver.invoke('AutoNormImpedance','False');
Solver.invoke('NormingImpedance','50');
Solver.invoke('CalculateModesOnly','False');
Solver.invoke('SParaSymmetry','False');
Solver.invoke('StoreTDResultsInCache','False');
Solver.invoke('FullDeembedding','False');
Solver.invoke('SuperimposePLWExcitation','False');
Solver.invoke('UseSensitivityAnalysis','False');
release(Solver);
any suggestion what goes wrong with the above code

i was not using the following command:
Solver.invoke('Start');
the rest will just work fine