What is the syntax error?

Make sure you put a semicolon (;) after your catch Error with {} statement. This is a statement, not a block construct like if and while.

use Error qw(:try); 
try { 
   `$create_script $input`; #code that might thrown an exception; 
   return; 
} catch Error with { 
   my $error_handler = shift; # Get hold of the exception object 
}; # <-- Semicolon
exit;
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