is there anyone who knows why this error occurrs?
LITE_SERVER_UNKNOWN: cannot apply external message to current state : External message was not accepted

In order to debug such errors, you should post the whole error, or, better, the code that caused it and the contract address.

can i dm you?

Please try searching in this chat, most cases of "external message was not accepted" already have explanation here.
If you don't find one, DM is OK.

thanks

the problem is that i don’t get any error, it seems that the transaction itself is not starting to be processed
data: {
ok: false,
error: 'LITE_SERVER_UNKNOWN: cannot apply external message to current state : External message was not accepted\n' +
'Cannot run message on account: inbound external message rejected by transaction B0321F614671C655D7F958F199B30DEB39C4FA511637373B1898F63E89BE1A56:\n' +
'exitcode=0, steps=0, gas_used=0',
code: 500
}

Is the contract deployed? steps=0 suggests that it isn't.

so i sent money to it and would like to deploy it with this transaction

or i’m missing smth

You have to send StateInit in the transaction to deploy the contract.