I'm just guessing here, but you apparently still don't have the fileevent syntax correct. You still have

Tkx::fileevent( $client, readable =>[\&handle_connection, \$client] );

# whereas the correct syntax I previously posted is
Tkx::fileevent($fh, readable => [\&run_watch, $fh]);
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Notice, you have \$client as a reference instead of a plain filehandle