Traceback (most recent call last):

 "./hello_world_vcenter.py", line 104, in <module>
main()

 "./hello_world_vcenter.py", line 85, in main
print "The server is {}!".format(args.host)ValueError: zero length field name in format`
Traceback (most recent call last):


 "/Users/ahmet-anil.pala/klarna_repos/fraud-model-utils/.venv/lib/python3.7/site-packages/vaex/dataframe.py", line 3557, in table_part

values = dict(zip(column_names, df.evaluate(column_names)))


 "/Users/ahmet-anil.pala/klarna_repos/fraud-model-utils/.venv/lib/python3.7/site-packages/vaex/dataframe.py", line 2626, in evaluate

return self._evaluate_implementation(expression, i1=i1, i2=i2, out=out, selection=selection, filtered=filtered, array_type=array_type, parallel=parallel, chunk_size=chunk_size)


 "/Users/ahmet-anil.pala/klarna_repos/fraud-model-utils/.venv/lib/python3.7/site-packages/vaex/dataframe.py", line 5483, in _evaluate_implementation

dtypes[expression] = dtype = df.data_type(expression).internal


 "/Users/ahmet-anil.pala/klarna_repos/fraud-model-utils/.venv/lib/python3.7/site-packages/vaex/dataframe.py", line 1968, in data_type

data = self.evaluate(expression, 0, 1, filtered=True, array_type=array_type, parallel=False)


 "/Users/ahmet-anil.pala/klarna_repos/fraud-model-utils/.venv/lib/python3.7/site-packages/vaex/dataframe.py", line 2626, in evaluate

return self._evaluate_implementation(expression, i1=i1, i2=i2, out=out, selection=selection, filtered=filtered, array_type=array_type, parallel=parallel, chunk_size=chunk_size)


 "/Users/ahmet-anil.pala/klarna_repos/fraud-model-utils/.venv/lib/python3.7/site-packages/vaex/dataframe.py", line 5570, in _evaluate_implementation

value = scope.evaluate(expression)


 "/Users/ahmet-anil.pala/klarna_repos/fraud-model-utils/.venv/lib/python3.7/site-packages/vaex/scopes.py", line 102, in evaluate

result = self[expression]


 "/Users/ahmet-anil.pala/klarna_repos/fraud-model-utils/.venv/lib/python3.7/site-packages/vaex/scopes.py", line 152, in __getitem__

values = self.evaluate(expression)


 "/Users/ahmet-anil.pala/klarna_repos/fraud-model-utils/.venv/lib/python3.7/site-packages/vaex/scopes.py", line 108, in evaluate

result = eval(expression, expression_namespace, self)


 "<string>", line 1, in <module>
NameError: name 'C' is not defined
