Hi @rburkholder,
I have the same issue, after getting the Err_02 and seek for any hint on the web I found and reading the Modules.pm code, I've found a workaround manually copying the Map.pm file of my plugin in
/etc/ocsinventory-server/perl/Apache/Ocsinventory/Plugins/<Plugin_name>/Map.pm
and the configuration file in
/etc/ocsinventory-server/plugins/lastupdate/<plugin_name>.conf
Take care of the case ov Plugin_name and plugin_name, it's not a typo.
I hope that this can help you.
Gabriele