When I attempt to run some TCL commands using the ChipScope TCL engine, an error message appears:

How do I work around this issue?
You do not need to re-install. This issue is usually related to how your environment is setup.
Ensure that your %XILINX% and %CHIPSCOPE% environment variables point to a valid install.
Also, ensure that they are correctly set in your %PATH% and %LD_LIBRARY_PATH% environment variables.
For further information on setting up these variables, refer to the "Troubleshooting Guide" section of the ChipScope Pro Software and Cores User Guide:
http://www.xilinx.com/support/documentation/dt_chipscopepro_chipscope11-1.htm