swapExactTokensForETHSupportingFeeOnTransferTokens and transfer_from_failed

I am integrating liquidity with pancakeswap.
Btw when i call swapExactTokensForETHSupportingFeeOnTransferTokens, i keep got error: transfer_from_failed.
I am newbie and I can’t understand i get this error.
I want someone to help me on this error.
Sincerely.

Hi @li_qimeng. Can you provide more background about what you’re trying to do, what you understand about the issue, what you think could be happening, etc.

I forked safemoon contract and customized it.
But when I add liquidity, I get error: Transfer_from_failed.
I don’t use truffle or zeplin and I am working on only Remix.
I need help on this prolem.
Thanks