Problem validating uploaded description file: XML does not correspond to XSD schema. Error Element '{http://openml.org/openml}nominal_value': [facet 'minLength'] The value has a length of '0'; this underruns the allowed minimum length of '1'.
on line 1198 column 0. Error Element '{http://openml.org/openml}nominal_value': '' is not a valid value of the atomic type '{http://openml.org/openml}basic_latin256'.
on line 1198 column 0. Error Element '{http://openml.org/openml}nominal_value': [facet 'minLength'] The value has a length of '0'; this underruns the allowed minimum length of '1'.
on line 2253 column 0. Error Element '{http://openml.org/openml}nominal_value': '' is not a valid value of the atomic type '{http://openml.org/openml}basic_latin256'.
on line 2253 column 0.