[Wien] VK-COUL not well converged: Increase GMAX or decrease NCON

[Dr. K. C. Bhamu]

Dear Experts,
We are running a GGA-PBE calculation on a cubic double perovskite on
Wien2k_19.1 with intel compilers with

 8     10   6   ELPA pxq hm (R-MT*K-MAX,MAX L IN
WF,V-NMT,lib,gridshape,hm/lm)
GMAX=12
We are getting VK-COUL error.

Exact warning is this:  VK-COUL not well converged: Increase GMAX or
decrease NCON
There is no information on mailing list and UG on this warning.
Could someone please explore the meaning of these warnings?

PS: Running scf with dense k-mesh on a scf that was finished with
Wien2k_18.2.

regards
Bhamu
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