We revised fit4NM as follows.

The previous version (3.3.7) was not able to calculate CWRES etc when used along with NONMEM 7.2.0.
This problem was fixed in the new version of 3.3.8.
However, run table is not automatically made after complettion of a run and *.sum file is not generated, even in the fit4NM 3.3.8. We are now researching to fix this problem.
A work-around for this is to use the function "make run table..."
We revised fit4NM to generate *.sum file after making run table.
Once run table was made, the other functions in fit4NM seem to work quite well.