Failure to find Named Subroutines

I have always had problems with named subroutines but lately I cannot get them to work at all.I get the following message;

LinuxCNC Error Near line 4 of/home/rpi-first-boot-wizard/linuxcnc/nc_files/Utility_G_Code/test.ngc:Failed to find sub 'Omyfile.ngc' before EOF

In this case I had a dead simple routine named 'test.ngc' that called a dead simple subroutine named 'my file.ngc'.

The location of the files and subroutines was called out in the .init file.

I have used named subroutines in the past.  I now use Raspberry Pi 4 and 5 with Axis 2.9.4 versions.

Any fool proof method for handling these subroutines would be appreciated.
I have a boat load of specializedsub routines lying dormant.

The name must always match

file:
myfile.ngc

in the subroutine:
o<myfile> sub
  some code
o<myfile> endsub

call the sub:
o<myfile> call