I can't reproduce your problem with the code you gave us. I just added a print statement after the
return $instance if defined $instance; line, and a at the end of the program a call to
Encoder::Config::get_instance. The print statement is executed (and later it dies because it can't find method load_config, but that's expected).
So the problem is not in the part of the script that you showed us.
(In case you haven't already, make sure to use strict; to avoid unintentional magic).
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