label predicted by the nnunet drag into itk-snap report error

[kid10590]

Why do I use the label predicted by the nnunet trained model to drag it into itk-snap and report an error? The error is : "Error :Wrong Format The IO library for the format can not read the image file. Some of the predicted labels in the same batch are normal, and some will report errors. After decompression, transfer it to itk-snap and there will be no error.