Makeup gas and constant flow

Hello,

I'm using an Agilent 6890 GC with a Splitt/ Splittless and a Purged Packed inlet and two TCD's. I installed a packed kolom on the PP inlet and on one detector. Column flow was set to constant flow.
While giving the system a Setup an instrument failure appeared. In the message center was given: Setup Error - Front Detector. After changing the Makeup Mode from Constant Makeup + Column to No Makeup the system went Idle and the problem seems to be solved.

I'm asking myself why gives it a failure on the Makeup Mode? Is it not possible to set a Makeup flow while using Constant flow? Or is it not possible to use a Makeup flow while a packed column is installed? Or is there another reason for this?

Thanks for suggestions of answers.
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