---------------------------------------------------------------------------
KeyError                                  Traceback (most recent call last)
c:\workspace\data-describe\data_describe\backends\_backends.py in _load_compute_backend(backend)
    151     try:
--> 152         return _compute_backends[backend]
    153     except KeyError:

KeyError: 'None'

During handling of the above exception, another exception occurred:

ModuleNotFoundError                       Traceback (most recent call last)
c:\workspace\data-describe\data_describe\backends\_backends.py in _load_compute_backend(backend)
    154         try:
--> 155             module = importlib.import_module(backend)
    156             _add_compute_backend(backend, module)

~\.conda\envs\test-env\lib\importlib\__init__.py in import_module(name, package)
    126             level += 1
--> 127     return _bootstrap._gcd_import(name[level:], package, level)
    128 

~\.conda\envs\test-env\lib\importlib\_bootstrap.py in _gcd_import(name, package, level)

~\.conda\envs\test-env\lib\importlib\_bootstrap.py in _find_and_load(name, import_)

~\.conda\envs\test-env\lib\importlib\_bootstrap.py in _find_and_load_unlocked(name, import_)

ModuleNotFoundError: No module named 'None'

During handling of the above exception, another exception occurred:

ValueError                                Traceback (most recent call last)
<ipython-input-6-c95efe736877> in <module>
----> 1 dd.data_heatmap(data)

c:\workspace\data-describe\data_describe\core\heatmap.py in data_heatmap(data, missing, compute_backend, viz_backend, **kwargs)
    115     """
    116     hwidget = _get_compute_backend(compute_backend, data).compute_data_heatmap(
--> 117         data, missing=missing, **kwargs
    118     )
    119     hwidget.viz_backend = viz_backend

c:\workspace\data-describe\data_describe\backends\_backends.py in _get_compute_backend(backend, df)
    126             modules = _compute_backends[backend]
    127         else:
--> 128             modules = _load_compute_backend(backend)
    129         backend_collection.append(modules)
    130     backend_list = [module for d in backend_collection for _, module in d.items()]

c:\workspace\data-describe\data_describe\backends\_backends.py in _load_compute_backend(backend)
    158             return _compute_backends[backend]
    159         except ImportError:
--> 160             raise ValueError(f"Could not find compute backend '{backend}'")
    161 
    162 

ValueError: Could not find compute backend 'None'