Torch.load older .pth files leads to error

When I save a dataset loader to a .pth file in one version of pytorch and try to load it in a later version of pytorch I get the error UnicodeDecodeError: ‘ascii’ codec can’t decode byte 0x95 in position 148: ordinal not in range(128)

Does this mean I will have to generate the dataset loader again ? Is there any other workaround ?