I send some msg to smart contract by "await client.sendExternalMessage(wallet, transfer)" on typescript.
I can`t get any error message, but state is not changed according my desire
How can i get error message?

I send some msg to smart contract by "await client.sendExternalMessage(wallet, transfer)" on typescript.
I can`t get any error message, but state is not changed according my desire
How can i get error message or transaction id or the result of (success or failure)?

If external message failed then there's no place to look its transaction ID, as this message "never existed".
Maybe, you should try another library, that will return you the server's response.

This is my tx

https://tonscan.org/address/EQA6lau-KEykQMbog-5s8x93KhDkIzfB2nYEA8GGMWccplDp

You can see error code 14 on last tx

Could you explain about 14?

Exit code -14 means that there is not enough gas (in this tx, even to launch TVM).

How can I get description about errors

like as url?

https://ton.org/docs/learn/tvm-instructions/tvm-exit-codes

thank you!