Failed to find data adapter that can handle input: , ( containing values of types {“”})

I was facing the same issue. Turns out it was a in the form of a list. I had to convert the fields into a numpy array like:

training_padded = np.array(training_padded)
training_labels = np.array(training_labels)
testing_padded = np.array(testing_padded)
testing_labels = np.array(testing_labels)

thats it!