Not able to generate/build plc code by the plc code generator in SIMULINK, solution please?

I am Facing the following error while creating the plc code from the inbuilt plc demo in simulink help

Message: PLC Coder Error source: plcdemo_simple_subsystem

Error Creating Directory :"./rtwgeb_tlc": Permission Denied

Message: PLC Coder Log Source: plcdemo_simple_subsystem

PLC code genetration failed for 'plcdeme_simple_subsystem/SimpleSubsystem'

[Kaustubha Govind]

You probably need to change your current working directory to another folder where you have write permissions.