please help me to debug this error i have an error report like missing $ on loop at hashreplace.pl this is my code

#!/usr/bin/perl
use warnings;
use strict;
use Data::Dumper;
my %xhash = ('a' => {
                 'b' => {
                        'e' => 'E',
                        'c' => 'C',
                        'content' => 'B
'
                      },
                 'content' => 'A
',
                 'd' => 'D'
               });
     my $key = keys(%xhash);
     print $key;
my %c_hash=('a' => {
                   'addval' => {
                                 'b' => {
                                          'addval' => {
                                                        'e' => {
                                                                 'addv
+al' => {},
                                                                 'repv
+al' => '5'
                                                               },
                                                        'c' => {
                                                                 'addv
+al' => {},
                                                                 'repv
+al' => '3'
                                                               }
                                                      },
                                          'repval' => '2'
                                        },
                                 'd' => {
                                          'addval' => {},
                                          'repval' => '4'
                                        }
                               },
                   'repval' => '1'
                 });
     print $c_hash{'a'}{'repval'};
     foreach keys($xhash){
     keys(%xhash)=$c_hash{'$key'}{'repval'};
     print Dumper $xhash;}
[download]

i want to replace xhash keys against c_hash values i mean this output only i want

%xhash = ('1' => {
                 '2' => {
                        '5' => 'E',
                        '3' => 'C',
                        'content' => 'B
'
                      },
                 'content' => 'A
',
                 '4' => 'D'
               });
[download]

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