As discussion ,you have one chance to prove that you are able to get along with this work kha.
2 times mistake , I tried to accept this kha.
If it has the 3rd time, you will not be happy with some kind of this work because it will come all year.
Also ,I will not be happy as well.
As you know ,we don't have sufficient time for trial error because our figures are very important for management.
Please believe in yourself what you are able to improve it.
If not, I don't want you to lose your confidence for your work na ka.