human
Solve the following python programming problem given the following code:
def _parseLabelValues(self, values) : 
    def createValue(value) : 
        try : 
            if ('-' in value) : 
                (v1, v2) = value.split ('-', 1) 
                (i1, i2) = (int (v1), int (v2)) 
                if (i1 > i2) : 
                    raise error.PayloadError (('Label value %s is in descending order, which is not allowed.' % value)) 
else : 
                i1 = int (value) 
                i2 = i1 
return (i1, i2) 
except ValueError : 
            raise error.PayloadError (('Label %s is not an integer or an integer range.' % value)) 
if (type (values) is str) : 
        values = values.split (',') 
parsed_values = sorted ([createValue (value) for value in values]) 
    nv = [] 
    for (v1, v2) in parsed_values : 
        if (len (nv) == 0) : 
            nv.append ((v1, v2)) 
            continue 
l = nv [(- 1)] 
        if (v1 <= (l [1] + 1)) : 
            nv = (nv [: (- 1)] + [(l [0], max (l [1], v2))]) 
else : 
            nv.append ((v1, nv)) 
return nv 

    
    

    Fix the buggy line: nv.append ((v1, nv))
assistant
#Here is Python program to fix the buggy line: nv.

nv.append ((v1, v2))