License error with ModelSim-Altera 10.0c (paid)

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when i run the vsim application, the following error appears :

unable to find the license file. it appears that your license file environment variable (e.g., lm_license_file) is not set correctly.

unable to checkout a license. vsim is closing.

** fatal: invalid license environment. application closing.

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The error message is telling you something, did you look at your environment variable? At a bash shell type:

echo $LM_LICENSE_FILE

It should be something like 1234@myserver.

Cheers,

Dave