[Wien] :WARN : WARNING: RKmax reduced due to NMATMAX

[chin Sabsu]

Dear Sir,
I am running the O2 molecule (F-cell) on an i5desktop with 8GM memory, Ubuntu 16.04, Wien2k_17.1.
I am getting the error:  :WARN :      WARNING: RKmax reduced due to NMATMAX

After scratching the mailing list I supposed to overcome this issue if I increase NMATMAX and NUM value but it also not helpful.
My default NMATMAX (NUM) was 19000 (6000) I increased NMATMAX (NUM) up to 25000 (8000) but still getting the same warning.

Please help me.
Cell size is 15Ang x 18 Ang with one k-point.
Thanks in Advance!
RegardsChin
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