Puzzling Compiler warning

I am trying compile this routine (RC1.f90) and it points to a WARNING on a line that apparently has no reference to a function.

The program runs OK, but I am wondering about what might trigger this.

I am uploading two source code files, not the whole program.

Would dividing the file up into its component parts make a difference? should it?

KOUNT_1 is a MODULE that all the routine use.