Association Rule Generation

 am new in WEKA and association rule mining. I have the file in arrf fomat I can open the file with Weka no problem but I can not get any result it thinks and thinks and then generates out of memory error. I dont have too many attributes and all my atributes are nominal. It should not be a problem  guess. Should the attributes be nominal in order to generate association rule. The only setiing i change is , I set lowerbound to 0.01 since what I have told.I have attached the file could you guys see what is wrong with it. What is the meaning of lowerbound. I have many null values for attributes but each attribute has at least one value. Is there any way to ommit null values .

 

Thanks