Gas estimation failed/Error

i am trying to develop a token on binance smart chain but i keep getting this error code.

Gas estimation errored with the following message (see below). The transaction execution will likely fail. Do you want to force sending?
Returned error: {"jsonrpc":"2.0","error":"invalid opcode: opcode 0x5f not defined","id":354124603366989}

Thank you very much.You Just solved my Stress.

Also how do i get to verify this contract address? as i made use of the openzepplin default contract.

Thank you again

thank you.

but i cant find flattener on my remix

see Verify ERC20 token on Etherscan that was deployed through Remix: Step by Step Guide

i eventually find it. Thanks

but i keep getting this error when i try verifying on BSC

Error! Unable to generate Contract Bytecode and ABI

That is a generic error, you would need to look into it. There is a section in my previous link which mentions possible causes.