# Error message when using pennylane molecular dataset **URL:** \ **Category:** PennyLane Help\ **Created:** [September 23, 2023, 7:06am UTC](https://discuss.pennylane.ai/t/error-message-when-using-pennylane-molecular-dataset/3466 "2023-09-23T07:06:49Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Den](https://avatars.discourse-cdn.com/v4/letter/d/ce7236/32.png) [@Den](https://discuss.pennylane.ai/u/Den)\ **Post date:** [September 23, 2023, 7:06am UTC](https://discuss.pennylane.ai/t/error-message-when-using-pennylane-molecular-dataset/3466/1 "2023-09-23T07:06:49Z")
I copied and pasted the data.load code from the N2H2 page ([N2H2 Molecule](https://pennylane.ai/datasets/qchem/n2h2-molecule)) and got an error message when executing it (code below). Am I missing something? ```auto import pennylane as qml from pennylane import numpy as np qml.data.load("qchem", molname="N2H2", bondlength=1.247, basis="STO-3G") ``` The error message is below. ```auto --------------------------------------------------------------------------- TypeError Traceback (most recent call last) Input In [18], in () ----> 1 qml.data.load("qchem", molname="N2H2", bondlength=1.247, basis="STO-3G") File /usr/local/lib/python3.8/site-packages/pennylane/data/data_manager.py:272, in load(data_name, attributes, lazy, folder_path, force, num_threads, **params) 269 for folder in all_folders: 270 real_folder = os.path.join(directory_path, data_name, folder) 271 data_files.append( --> 272 Dataset(data_name, real_folder, folder.replace(pathsep, "_"), docstring, standard=True) 273 ) 275 return data_files File /usr/local/lib/python3.8/site-packages/pennylane/data/dataset.py:148, in Dataset. __init__ (self, standard, *args, **kwargs) 146 raise ValueError(f"Expected {name} to be a str, got {type(val). __name__ }") 147 self._is_standard = True --> 148 self. __std_init__ (*args) 149 else: 150 self._is_standard = False File /usr/local/lib/python3.8/site-packages/pennylane/data/dataset.py:122, in Dataset. __std_init__ (self, data_name, folder, attr_prefix, docstring) 120 self._fullfile = prefix.format("full") 121 if os.path.exists(self._fullfile): --> 122 self.read(self._fullfile, lazy=True) 123 else: 124 self._fullfile = None File /usr/local/lib/python3.8/site-packages/pennylane/data/dataset.py:206, in Dataset.read(self, filepath, lazy, assign_to) 183 def read(self, filepath, lazy=False, assign_to=None): 184 """Loads data from a saved file to the current dataset. 185 186 Args: (...) 204 tensor([1, 1, 0, 0], requires_grad=True) 205 """ --> 206 data = self._read_file(filepath) 207 file_contains_dataset = True 208 if assign_to is not None: File /usr/local/lib/python3.8/site-packages/pennylane/data/dataset.py:181, in Dataset._read_file(filepath) 179 zstd, dill = _import_zstd_dill() 180 depressed_pickle = zstd.decompress(compressed_pickle) --> 181 return dill.loads(depressed_pickle) File /usr/local/lib/python3.8/site-packages/dill/_dill.py:327, in loads(str, ignore, **kwds) 316 """ 317 Unpickle an object from a string. 318 (...) 324 Default values for keyword arguments can be set in :mod:`dill.settings`. 325 """ 326 file = StringIO(str) --> 327 return load(file, ignore, **kwds) File /usr/local/lib/python3.8/site-packages/dill/_dill.py:313, in load(file, ignore, **kwds) 307 def load(file, ignore=None, **kwds): 308 """ 309 Unpickle an object from a file. 310 311 See :func:`loads` for keyword arguments. 312 """ --> 313 return Unpickler(file, ignore=ignore, **kwds).load() File /usr/local/lib/python3.8/site-packages/dill/_dill.py:525, in Unpickler.load(self) 524 def load(self): #NOTE: if settings change, need to update attributes --> 525 obj = StockUnpickler.load(self) 526 if type(obj). __module__ == getattr(_main_module, ' __name__', ' __main__'): 527 if not self._ignore: 528 # point obj class to main File /usr/local/lib/python3.8/site-packages/dill/_dill.py:661, in _create_code(*args) 659 if len(args) == 16: return CodeType(*args) 660 elif len(args) == 15: return CodeType(args[0], 0, *args[1:]) --> 661 return CodeType(args[0], 0, 0, *args[1:]) 662 elif hasattr(CodeType, 'co_kwonlyargcount'): 663 if len(args) == 16: return CodeType(args[0], *args[2:]) TypeError: code() takes at most 16 arguments (19 given) ``` And, finally, make sure to include the versions of your packages. Specifically, show us the output of `qml.about()`. ---
**Author:** ![Ivana\_at\_Xanadu](https://yyz2.discourse-cdn.com/flex012/user_avatar/discuss.pennylane.ai/ivana_at_xanadu/32/1852_2.png) [@Ivana\_at\_Xanadu](https://discuss.pennylane.ai/u/Ivana_at_Xanadu)\ **Post date:** [September 26, 2023, 12:19pm UTC](https://discuss.pennylane.ai/t/error-message-when-using-pennylane-molecular-dataset/3466/2 "2023-09-26T12:19:44Z")
Hey @Den , I retraced your steps here and Iโ€™m not getting the same error. ๐Ÿค” Did you include the full code you were running? It might also be helpful to include the output of `qml.about()`. ๐Ÿ™‚ ---
**Author:** ![whatsis](https://yyz2.discourse-cdn.com/flex012/user_avatar/discuss.pennylane.ai/whatsis/32/1019_2.png) [@whatsis](https://discuss.pennylane.ai/u/whatsis)\ **Post date:** [September 27, 2023, 6:04pm UTC](https://discuss.pennylane.ai/t/error-message-when-using-pennylane-molecular-dataset/3466/3 "2023-09-27T18:04:55Z")
Hey @Den, from the error message, it looks like youโ€™re using an old version of PennyLane, which used `zstd` and `dill`. Please upgrade your PennyLane package, delete any existing dataset files/folders and let me know if the error message persists. ๐Ÿ™‚