There is no where near enough information there.
What Error Message are you getting?
What are you trying to do?

You can create your own Error Messages using MsgBox
The is also The Universal Dialog Box covered in Developer 11 and Developer 12

Error Messages

Old Custom Error tip

I think there was a option I learn in an old Access 2003 VBA in which when an error pops up you can get the error code in the Immediate Window and then respond with a custom error message when that happens. it that still applicable in access 365 ?

Do you mean Debug.Print?

The simple example in my screenshot below shows:
   The Error Number
   The System Generated Message
   A Custom Error Message