'MATLAB LiveLink with comsol

I want to connect MATLAB with comsol server, prior to this I have established comsol server using MATLAB. When I tried to connect MATLAB to comsol server using b"mphstart()" command there error appears on the command window

Error using mphstart no user information found. please specify username and password at the comsol multiphysics server prompt and run mphstart.

How do I remove this error and established MATLAB connection with comsol server



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