check in network tab, for those 400 errors, what was the payload and what was the error message
solve this problem. bt now can not run
when our product sell button clicks. then give metamask problem
how to fix
It could depend, you need matic in that account, also you have to call the right contract address.
From that error it looks like it will be an execution error in the contract code and it can not estimate the gas.
Now how can fix this problem?
I don’t know, you have to provide more info, try to debug it to see what happens.