Pybrain: 'SupervisedDataSet' object has no attribute '_convertToOneOfMany' error

[ghost]

I'm working on speech recognition using raspberry pi while I was running the code of the build model using pybrain features I got the error:'SupervisedDataSet' object has no attribute '_convertToOneOfMany' ?
If anyone has any pointers to get me back on the right path and that would be very much appreciated.
`
def createRGBdataSet(inputSet, numOfSamples, numOfPoints):
alldata = ClassificationDataSet(numOfPoints, 1, nb_classes=3)
# Iter through all 3 groups and add the samples with appropriate class label
for i in range(0, 3numOfSamples):
input = inputSet[i]
if (i < numOfSamples):
alldata.addSample(input, [0])
elif (i >= numOfSamples and i < numOfSamples2):
alldata.addSample(input, [1])
else:
alldata.addSample(input, [2])
return alldata

Split the dataset into 75% training and 25% test data.

def splitData(alldata):
tstdata, trndata = alldata.splitWithProportion( 0.25 )
trndata._convertToOneOfMany()
tstdata._convertToOneOfMany()
return trndata, tstdata
`