Hello, I am trying to return XML data for certain routes in my dancer2 app (depending on a request param). Code below:

set serializer => 'JSON';

hook after => sub{
    if (request->params->{format} eq 'xml'){
          send_as XML => "dsfsdf",{ content_type => 'application/xml; 
+charset=UTF-8' };
    }
    #else return the response in json format
}
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However, the send_as is causing an error and not working. If I move the send_as to inside the route, it works. It only gives an exception when placed inside the hook after method. The error is:

 Exception caught in 'core.app.after_request' filter: Hook error: Can'
+t use string ("") as a subroutine ref while "strict refs" in use at /
+usr/local/share/perl5/Dancer2/Core/App.pm line 1103.
 at /usr/local/share/perl5/Dancer2/Core/App.pm line 36. in /usr/local/
+share/perl5/Dancer2/Core/App.pm l. 676
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Any ideas? Thanks a lot.