K means clustering using weka python

from weka.clusterers import Clusterer import weka.core.converters as converters data = converters.load_any_file("/home/ubuntu/test.csv") data.class_is_last() clusterer = Clusterer(classname="weka.clusterers.SimpleKMeans", options=["-N", "3"]) clusterer.build_clusterer(data) print(clusterer) cluster the data for inst in data: cl = clusterer.cluster_instance(inst) # 0-based cluster index dist = clusterer.distribution_for_instance(inst) # cluster membership distribution print("cluster=" + str(cl) + ", distribution=" + str(dist)) I used the above code for doing k means custering i am not able to execute the program The following are the errors i get Traceback (most recent call last): File "clus.py", line 6, in data = converters.load_any_file("/home/ubuntu/hello.csv") File "/usr/local/lib/python2.7/dist-packages/weka/core/converters.py", line 255, in load_any_file loader = loader_for_file(filename) File "/usr/local/lib/python2.7/dist-packages/weka/core/converters.py", line 239, in loader_for_file "(Ljava/lang/String;)Lweka/core/converters/AbstractFileLoader;", filename) File "/usr/local/lib/python2.7/dist-packages/javabridge/jutil.py", line 932, in static_call fn = make_static_call(class_name, method_name, sig) File "/usr/local/lib/python2.7/dist-packages/javabridge/jutil.py", line 903, in make_static_call klass = env.find_class(class_name) AttributeError: 'NoneType' object has no attribute 'find_class' I dont know y i am getting this errors.. can someone help me with this?