I am getting the following warning while running my code

Use of uninitialized value in pattern match (m//) at orphan_plf.pl line 37

and line 37 is $Hash_filematches{$filename}= grep( /\/\Q$file_name\E#/i, $Hash_filenames{$plf} ); The objective of my program

1.Get all the filenames with .plf extension from a directory

2.Store the filename as key and the corresponding lines of it as values in a hash

3.For every filename in the hash saved in step 2 grep for a filename in the corresponding lines and save the filename and the corresponding match in another hash and them print the hash

Please help

#!/usr/bin/perl -w  
use strict;   
use warnings;   
my %Hash_filenames=(); 
my %Hash_filematches=(); 
my $plf; 
my $start_dir; 
my $start_dir = \\server1\tools ; 
 
my $file_name = "load.c"; 
 
opendir(DIR, "$start_dir"); 
my @plf_files = grep(/\.plf$/,readdir(DIR)); 
print "PLF FILES\n"; 
print "@plf_files\n"; 

foreach my $plf (@plf_files) { 
chomp($plf); 
open my $match, '<',"$start_dir\\$plf" or die "could not open '$plf' $
+!"; 
my @file_lines = <$match>; 
#Save the filename as key and the lines in the file as value in a hash
+ 
$Hash_filenames{$plf}=@file_lines; 
} 
closedir(DIR); 
    if ($file_name)  {  
 
foreach my$filename(keys %Hash_filenames) { 

#for every  key(filename) in the above hash namely #$Hash_filenames  
#grep for  $file_name  in the  
#corresponding values (lines in the file)of the file  
#and save the match  as value and key as filename  
#in another hash 
$Hash_filematches{$filename}=  grep( /\/\Q$file_name\E#/i, $Hash_filen
+ames{$plf} );     
} 
}  
{  
    local $, = "\n";  
    print "PRINTING MATCHED HASHES"; 
foreach my $key ( keys %Hash_filenames ) { 
        my $value = $Hash_filematches{$key}; 
        print "$key => $value\n"; 
    } 
}
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