I'm using the package PEST in processing Modflow in order to calibrate K_x,y and K_z. When i run Pest an error message appears; In the "PEST.CHK" there is the follow message:

PESTCHEK Version 4.10. Watermark Numerical Computing.

Errors ----->

No errors encountered.

Warnings ----->

PEST control file uses old format - no value for NOBSGP and/or observation

groups provided.

I have inserted the observation data using the command "borehole/observation" in modflow.

I have tried some modification but the warning remains.

Which colud be the problem?

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