I'm trying to implement Family Trees into my project with this tutorial:
http://pokemonessentials.wikia.com/wiki/Tutorial%3AFamily_Tree
I'm getting errors and when I try to access the Family Tree menu the game crashes.

Here's all the errorlogs:
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Pokemon Evolution Blue
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[ArgumentError, "undefined class/module PokemonFamily", ["Section050:1743:in `oldload'", "Section050:1743:in `load'", "Section169:55:in `pbSetUpSystem'", "Section169:54:in `open'", "Section169:54:in `pbSetUpSystem'", "Section169:147"]]
---------------------------
OK
---------------------------

---------------------------
Pokemon Evolution Blue
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[EOFError, "End of file reached", ["Section050:1743:in `oldload'", "Section050:1743:in `load'", "Section169:56:in `pbSetUpSystem'", "Section169:54:in `open'", "Section169:54:in `pbSetUpSystem'", "Section169:147"]]
---------------------------
OK
---------------------------

---------------------------
Pokemon Evolution Blue
---------------------------
[EOFError, "End of file reached", ["Section050:1743:in `oldload'", "Section050:1743:in `load'", "Section169:57:in `pbSetUpSystem'", "Section169:54:in `open'", "Section169:54:in `pbSetUpSystem'", "Section169:147"]]
---------------------------
OK
---------------------------

---------------------------
Pokemon Evolution Blue
---------------------------
[EOFError, "End of file reached", ["Section050:1743:in `oldload'", "Section050:1743:in `load'", "Section169:58:in `pbSetUpSystem'", "Section169:54:in `open'", "Section169:54:in `pbSetUpSystem'", "Section169:147"]]
---------------------------
OK
---------------------------

The crashlog is pic related. If you know the problem and how to fix it please help.