Launching gsch2pcb on my Mac OS X 10.7.2 (11C73)

Hi Experts,
While launching gsch2pcb on my Mac OS X 10.7.2 (11C73) in assistance with OS X Launchers I found a problem is there. Have a look at the message below. What does it mean?
Please help me to solve the issue.
Thanks in advance.
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Problem initialising
Couldn't find 'pcb' executable
Couldn't find 'gsch2pcb' executable
