"No module named 'pytorch_lightning'"

[Supkrovi]

Can anybody help me with this problem? Thanks in advance.

_"Error occurred when executing LDSRUpscaler:
No module named 'pytorch_lightning'

File "G:\ComfyUI_windows_portable\ComfyUI\execution.py", line 317, in execute
output_data, output_ui, has_subgraph = get_output_data(obj, input_data_all, execution_block_cb=execution_block_cb, pre_execute_cb=pre_execute_cb)
^^^
File "G:\ComfyUI_windows_portable\ComfyUI\execution.py", line 192, in get_output_data
return_values = _map_node_over_list(obj, input_data_all, obj.FUNCTION, allow_interrupt=True, execution_block_cb=execution_block_cb, pre_execute_cb=pre_execute_cb)
^^^^
File "G:\ComfyUI_windows_portable\ComfyUI\execution.py", line 169, in map_node_over_list
process_inputs(input_dict, i)
File "G:\ComfyUI_windows_portable\ComfyUI\execution.py", line 158, in process_inputs
results.append(getattr(obj, func)(**inputs))
^^^
File "G:\ComfyUI_windows_portable\ComfyUI\custom_nodes\ComfyUI-Flowty-LDSR_init.py", line 124, in upscale
outputs.append(ldsr.superResolution(image, int(steps), pre_downscale, post_downscale, downsample_method))
^^^^
File "G:\ComfyUI_windows_portable\python_embeded\Lib\site-packages\torch\utils_contextlib.py", line 115, in decorate_context
return func(*args, **kwargs)
^^^^
File "G:\ComfyUI_windows_portable\ComfyUI\custom_nodes\ComfyUI-Flowty-LDSR\ldsrlib\LDSR.py", line 261, in superResolution
model = self.load_model_from_config()
^^^^^^
File "G:\ComfyUI_windows_portable\ComfyUI\custom_nodes\ComfyUI-Flowty-LDSR\ldsrlib\LDSR.py", line 88, in load_model_from_config
self.model = LDSR.load_model_from_path(self.modelPath, self.torchdevice)
^^^^^^^
File "G:\ComfyUI_windows_portable\ComfyUI\custom_nodes\ComfyUI-Flowty-LDSR\ldsrlib\LDSR.py", line 75, in load_model_from_path
pl_sd = torch.load(modelPath, map_location="cpu")
^^^^^^^
File "G:\ComfyUI_windows_portable\python_embeded\Lib\site-packages\torch\serialization.py", line 1025, in load
return _load(opened_zipfile,
^^^^^^^
File "G:\ComfyUI_windows_portable\python_embeded\Lib\site-packages\torch\serialization.py", line 1446, in load
result = unpickler.load()
^^^^^^
File "G:\ComfyUI_windows_portable\python_embeded\Lib\site-packages\torch\serialization.py", line 1439, in find_class
return super().find_class(mod_name, name)
"