Livelink for Matlab

Hi,

I would like to create a simple model using API in Matlab. When I type the command "shell.feature.create('fc1', 'FixedConstraint') ", errors "Unkonwn feature ID#FixedConstraint" exsit.

I have called for help from doucumention but found nothing. So what the "known feature ID" about the "FixedConstraint".

Many thanks for any help!