Invalid Taxonomy

Your taxonomy has the slug “Guide Categories” which is invalid. The first parameter is the name of the taxonomy, not the human readable name of the taxonomy. That gets defined in the labels.

I recommend you generate your taxonomy registration code using this generator:

http://themergency.com/generators/wordpress-custom-taxonomy/

It covers all the options available in a nice step by step Wizard with sensible defaults and explanations, and takes a large chunk of the work out of generating a full registration code snippet for you

For bonus points, you can use their custom post type generator too

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