"of undefined" means that some data that is required was not created.
causes for this are often continuing a game before the plugin was added (a lot of data is only generated on new game for plugins), or if plugins are incompatible to each other, or if they are missing configuration or database entries.
My first suggestion would be to test in two new projects if you can get the plugins to work alone, without the other ones (yanflies in one project, the ABS in the other). That will show you if you're missing any configuration or database settings.
If they work alone but not together, then the next step would be to try to change the order around as that can fix several possible incompatibilities.
If the plugins work alone but not together, the next stop would be to ask someone for a compatibility patch. But that would most likely require some payment as that is not easy....