Cannot sell token after mint the token

i try to sell my token but i cant sell it. this is the code contract i use

the contract already mint the token but cannot sell
can someone help me ?

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anyone please help me

There was an error code in the _basicTransfer() because you didn't check the balance of sender before sending some tokens.
I guess the underflow error was happened by you.

please help me about this. this is my life last saving money

any solution ? please help me with this