'Sequential' object has no attribute 'predict_proba'

This error message indicates that you are trying to use the `predict_proba` method on a `Sequential` object, which does not have this method.

The `predict_proba` method is used to predict the class probabilities of a classification model. However, not all models have this method. For example, some models like linear regression do not have this method.

To fix this error, you need to check the type of the model you are using and make sure it supports the `predict_proba` method. If it does not, you may need to use a different model or find an alternative way to obtain class probabilities.