Can't create Association Rules

npiani

First of all, hello everyone! I'm new to the forums and to Rapidminer itself. So pardon if I ask any dumb questions while I stumble my way through the program.
Now, to the good stuff.

I've been playing around with Rapidminer and I've come across an issue. I have an excel sheet containing data in the form

    customerId    itemId    itemCount

Where each column consists of only integers.

My problem is the following:
I'm using the Market Basket Template. If I only have around 20 rows or so, I get an output with no problem (though I have over 50k associations), but if I put in anymore (I have about 355 rows), I get no output whatsoever.

Any ideas? Any help would be appreciated. Let me know if I can clear anything up for you guys.
Thank you in advance