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?