I have this code in my DrillPressTable.pl file:

 #!/usr/bin/perl -w
 use strict 'vars';
 use VRML;
 ...
 my $Dir="vrmlstuff";
 my $Subdir="DrillPressTable";
 my $LumberFile="$Dir/$Subdir/lumber.wrl";
 &mystart($LumberFile,LF);
 ...
 sub mystart {
   my($file,$fh)=@_;
   open($fh,"> $file")
    || die("ERROR: Unable to open $file for output");
   my @lines=split(/\n/,<<END);
#VRML V2.0 utf8
NavigationInfo { headlight TRUE }
DirectionalLight { # First child
 direction 0 0 -1 # Light illuminating the scene
}
END
   my $i=0;
   if($i==0) {
     foreach my $line (@lines) {
       print $fh "$line\n";
     }
   } elsif($i==1) {
      &myprint(\@lines,$fh);
   } elsif($i==2) {
      &printout(\@lines,$fh);
   }
 } # end mystart
 ...
 sub myprint(
   my($lines,$fh)=@_;
   foreach my $line (@{$lines}) {
     print $fh "$line\n";
   }
 } # End myprint;

file VRML.pm contains this code:
 package VRML;
 BEGIN {
   @EXPORT = qw(... &printout ...);
 }
 use strict 'vars';
 ...
 sub printout {
   my($lines,$fh)=@_;
   $fh=STDOUT unless($fh);
   foreach my $line (@{$lines}) {
     print $fh "$line\n";
   }
} # End printout;
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If I set $i=0 or 1 in subroutine mystart it works perfectly, and the proper lines are written to lumber.wrl. But if I set $i=2 I get this error message: print() on unopened filehandle LF at .../VRML.pm line 2886 Line 2886 in VRML.pm is in printout; the line is:

print $fh "$line\n";
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How do I declare $fh in subroutine printout so it recognizes the intended filehandle?