The error is generated because of using a carriage return in a string used as a hash key as shown by the following code:

#!/usr/bin/perl
use strict;
use warnings;

my %hash = ("Common SW Component" => "4885");
my $variable = "foo\r";
print "variable ending with carrige return is =$variable=\n";
print "$hash{$variable}\n";
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Output is:

=ariable ending with carrige return is =foo
Use of uninitialized value in concatenation (.) or string at try1.pl l
+ine 8.
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Update:Even without the \r it would fail, simply because the hash value is undef and an attempt is made to print an undefined value.