ValueError: Failed to convert a NumPy array to a Tensor (Unsupported object type numpy.ndarray)

Dear everyone,
I did this

history = model.fit(trainX,
trainY,
epochs=10,
validation_data=(valX,valY)
)

and suffer this
ValueError: Failed to convert a NumPy array to a Tensor (Unsupported object type numpy.ndarray).

I have tried
valX = tf.convert_to_tensor(valX, dtype=float)
valY = tf.convert_to_tensor(valY, dtype=float)

but does not work. Please help me

Dear Sevien, can I know what type did you get for valX, valY, trainX, and trainY?
In addition, can I know which Specialization/Course/Week/Assignment are you referring to?
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