NotImplementedError: Cannot convert a symbolic Tensor (2nd_target:0) to a numpy array

NotImplementedError: Cannot convert a symbolic Tensor (2nd_target:0) to a numpy array 

I got this error when I was having NumPy version - 1.20 and I downgraded it into NumPy version -1.19

(Tensorflow version - 2.3 and python version - 3.8)

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