Error: too many groups.

Dear all

In my input file there are only 18 groups (less than 32 according to
the manual). However I have Error: too many groups.

I would be grateful if you let me know how I can solve this problem.

Thanks a lot for your attention,
Best Regards,
Saly

Dear all

In my input file there are only 18 groups (less than 32 according to
the manual). However I have Error: too many groups.

I would be grateful if you let me know how I can solve this problem.

please provide a (as small as possible) example input that reproduces this.
i am certain that there will be more than the 18 groups to claim.
either explicitly or implicitly.

axel.