System error

error:  malformed JSON string, neither tag, array, object, number, string or atom, at character offset 0 (before "(end of string)") at /opt/app/tradeindia/cw/modules/Website.pm line 1317.
context: 
... 
1313:  my $url = &get_backend() . '/component/rest/customized_sites/get_catalog_meta_info.html';
1314:  my $res = $ua->post( $url,{product_id=>$product_id});
1315:  my $response;
1316:  $response = $res->{_content};
1317:  my $data = decode_json($response);
1318:  if($data){
1319:  my $data_resp = $data->{'data'};
1320:  $resp_title = $data_resp->{'title'} if($data_resp->{'title'});
1321:  $resp_keywords = $data_resp->{'keywords'} if($data_resp->{'keywords'});
... 
code stack:  /opt/app/tradeindia/cw/modules/Website.pm:1317
/var/www/cw/gkonline.in/products_details.html:409
/var/www/cw/gkonline.in/autohandler.html:576
/opt/app/tradeindia/cw/components/syshandler.html:76
raw error






























malformed JSON string, neither tag, array, object, number, string or atom, at character offset 0 (before "(end of string)") at /opt/app/tradeindia/cw/modules/Website.pm line 1317.


Trace begun at /usr/share/perl5/HTML/Mason/Exceptions.pm line 125
HTML::Mason::Exceptions::rethrow_exception('malformed JSON string, neither tag, array, object, number, string or atom, at character offset 0 (before "(end of string)") at /opt/app/tradeindia/cw/modules/Website.pm line 1317.^J') called at /opt/app/tradeindia/cw/modules/Website.pm line 1317
Website::output_metainfo('Website=HASH(0x5632a979d318)', 'product_obj', 'HASH(0x5632aa7d48d0)') called at /var/www/cw/gkonline.in/products_details.html line 409
HTML::Mason::Commands::__ANON__('fn', 'palazzo', 'product_id', 5197044) called at /usr/share/perl5/HTML/Mason/Component.pm line 135
HTML::Mason::Component::run('HTML::Mason::Component::FileBased=HASH(0x5632a97d9758)', 'fn', 'palazzo', 'product_id', 5197044) called at /usr/share/perl5/HTML/Mason/Request.pm line 1302
eval {...} at /usr/share/perl5/HTML/Mason/Request.pm line 1292
HTML::Mason::Request::comp(undef, undef, undef, 'fn', 'palazzo', 'product_id', 5197044) called at /usr/share/perl5/HTML/Mason/Request.pm line 955
HTML::Mason::Request::call_next('HTML::Mason::Request::ApacheHandler=HASH(0x5632a97cf368)') called at /var/www/cw/gkonline.in/autohandler.html line 576
HTML::Mason::Commands::__ANON__('fn', 'palazzo', 'product_id', 5197044) called at /usr/share/perl5/HTML/Mason/Component.pm line 135
HTML::Mason::Component::run('HTML::Mason::Component::FileBased=HASH(0x5632a97d5800)', 'fn', 'palazzo', 'product_id', 5197044) called at /usr/share/perl5/HTML/Mason/Request.pm line 1302
eval {...} at /usr/share/perl5/HTML/Mason/Request.pm line 1292
HTML::Mason::Request::comp(undef, undef, undef, 'fn', 'palazzo', 'product_id', 5197044) called at /usr/share/perl5/HTML/Mason/Request.pm line 955
HTML::Mason::Request::call_next('HTML::Mason::Request::ApacheHandler=HASH(0x5632a97cf368)') called at /opt/app/tradeindia/cw/components/syshandler.html line 76
HTML::Mason::Commands::__ANON__('fn', 'palazzo', 'product_id', 5197044) called at /usr/share/perl5/HTML/Mason/Component.pm line 135
HTML::Mason::Component::run('HTML::Mason::Component::FileBased=HASH(0x5632a98687d8)', 'fn', 'palazzo', 'product_id', 5197044) called at /usr/share/perl5/HTML/Mason/Request.pm line 1300
eval {...} at /usr/share/perl5/HTML/Mason/Request.pm line 1292
HTML::Mason::Request::comp(undef, undef, undef, 'fn', 'palazzo', 'product_id', 5197044) called at /usr/share/perl5/HTML/Mason/Request.pm line 481
eval {...} at /usr/share/perl5/HTML/Mason/Request.pm line 481
eval {...} at /usr/share/perl5/HTML/Mason/Request.pm line 433
HTML::Mason::Request::exec('HTML::Mason::Request::ApacheHandler=HASH(0x5632a97cf368)') called at /usr/share/perl5/HTML/Mason/ApacheHandler.pm line 165
HTML::Mason::Request::ApacheHandler::exec('HTML::Mason::Request::ApacheHandler=HASH(0x5632a97cf368)') called at /usr/share/perl5/HTML/Mason/ApacheHandler.pm line 831
HTML::Mason::ApacheHandler::handle_request('HTML::Mason::ApacheHandler=HASH(0x5632a97d2390)', 'Apache2::RequestRec=SCALAR(0x5632a99c6ba0)') called at /opt/app/tradeindia/cw/modules/B2B/Handler/CW.pm line 127
eval {...} at /opt/app/tradeindia/cw/modules/B2B/Handler/CW.pm line 126
B2B::Handler::CW::handler('Apache2::RequestRec=SCALAR(0x5632a99c6ba0)') called at -e line 0
eval {...} at -e line 0