Saving a Joomla template or a CB template? Am not able to confirm with either, but am on Apache and not IIS. Are you both on IIS? Also note what you provided is just a Notice and would not cause a 500 error, please enable debug mode and maximum error reporting in Joomla global configuration (both are important) to expose errors then re-test and see if there are any on-screen errors.
Kyle (Krileon) Community Builder Team Member Before posting on forums:
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