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

Below is the solution to this famous error: https://medium.com/@italo.honorato/how-to-resolve-transferhelper-error-transfer-from-failed-fb4c8bf6488c

It concludes that this is a design error of the ERC20 standard itself applied to contracts that make exchanges from other accounts. If I'm wrong, please correct me.

Does anyone know how to guide me on how to open a discussion on the subject, for possible improvements in this?