Hi Martin,
It appears your python version is out of date. As mentioned in the INSTALL & QUICKSTART files, the splunkit-server role requires python 2.7+.
Specifically, this error is being thrown due to the check_output function in the subprocess module that was introduced in Python 2.7: http://docs.python.org/2/library/subprocess.html#subprocess.check_output
Let me know if any issues arise after upgrading python.
Thanks!
-Jason
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