0318_FeedForwardNetwork, Error: float() argument must be a string or a number, not ‘dict_values’

When i attempt to execute fit function with a graph to plot loss function, it shows an error"float() argument must be a string or a number, not ‘dict_values’"…Kindly help where to change the code.

Duplicate of Error: float() argument must be a string or a number, not ‘dict_values’