Serialization of a User Object(what is the problem)

my dear can you help me something about programming on I can not go beyond this step:

please help me i wait for your answer please.

What is going on? What are you trying to do? What part do you need help with? What errors are you experiencing? What else have you tried while attempting to solve the problem?

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I Have tried more times but he refuses to accept about the code

try to correct

I’ve got the same problem