problem with fp-growth!what should I do?

I want to work with a dataset about picture tags from flickr.com
it has 2 column like this:
...
garden blue
blue green
green blue
blue light
light blue
house blue
home blue
flowers garden
garden flowers
flowers green
green flowers
house flowers
home flowers
garden green
green garden
...
it tell us that when somebody tag a picture "garden",he also tag that picture "green"
I think association rules is the best way I can use for this kind of data.but I have problem with "fp-growth".when I use this algorithm,rapidminer shows error :
"Regular attributes must be of type binominal."
1 - What should I do??
2 -Is "fp-growth" fit for this kind of data?