Region Startup: Error Invoking DFHZPLT

The following error occurs when trying to start a region:
EP0016E Error invoking program: DFHZPLT
173     Called program file not found in drive/directory [DFHZPLT]
CF0002E Failed to configure region

Possible Cause and Resolution

This can occur if the REXBASE environment variable has not been set to the rex trunk location.

If this error occurs when running under IIS, ensure that the REXBASE environment variable is set in the system environment space. Environment variables expand at execution time rather than region startup time. Previously it would need to be set in the seestart or MMC environment space.