+ Unfortunately, you didn't mention which line of the code is failing...
++ Insert the
STOP
command as the very first line following your SUB declaration (such as line 2 in your original post) of your code and save.
++ click on your [KOSONGKAN] control.
++ you should enter the debugger at this point with the
STOP
as the highlighted command
++ [F8] to execute the next line of code. Which one is causing the error.
+ Are these controls bound to a record set?
That is to say, when in design view, with the properties pane open, what is the [control source] for each of the controls?
If any of the controls (such as [txtID] is bound to an autonumber field you will not be able to set that value.
Check your bytes.com inbox, I will forward you a copy of tutorials and resources.