As a first step to investigate this error, please check if this error reproduces in your local environment by installing xgboost locally.

If this error reproduces also locally, you can eliminate amazon-web-services / amazon-sagemaker tags from this post.

It is also recommended to add some information how you are calling the xgboost APIs to load the model, and how your model files are structured under the extracted model directory, as the error may be happening because of how the model is structured, and how to load it.