I am having a problem with my code, please help!

[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, 3*numOfSamples):
        input = inputSet[i]
        if (i < numOfSamples):
            alldata.addSample(input, [0])
        elif (i >= numOfSamples and i < numOfSamples*2):
            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