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This error typically occurs when working with sequences or tensors that have variable lengths. In order to perform certain operations on these sequences, such as concatenation, it is necessary to make them the same length. This can be achieved through padding, which involves adding zeroes or another specified value to the shorter sequences in order to make them the same length as the longest sequence.

To resolve the error, you can set the "padding=True" parameter when creating your tensor or sequence. This will ensure that any shorter sequences are padded with zeroes to match the length of the longest sequence. Alternatively, you may need to adjust the parameters of your operation to account for the variable lengths of the inputs.