Extract state space matrix

I run this command in Matlab but it has error
M = mphstate(model,'sol1','out',{'MA' 'MB' 'C' 'D'},...
'input', {'Heat1','Heat2'}, 'output', {'mod1.ppb1','mod1.ppb2','mod1.ppb3'});
Error:
Error using full
Out of memory. Type HELP MEMORY for your options.
Error in C:\Program
Files\COMSOL\COMSOL43b\mli\mphstate.p>mphstate (line 171)
Error in StateSpaceExport (line 7)
M = mphstate(model,'sol1','out',{'MA' 'MB' 'C' 'D'},...

Can you help me to solve this problem?
Thank you very much.