Primary button copy should:
be one or two words
either dismiss the screen, or take the user to a logical next step
have no full stop
Use an error screen to tell the user that an error has occurred during a flow.
There are 6 different illustrations that you can use on an error screen. Each one has a specific use case.
Title copy should:
be just a few words
clearly explain the error — the user shouldn’t need to read the description to understand the issue
not have any punctuation at the end
Description copy should:
explain the issue in more detail, and tell the user what to do next, if possible
reassure them their money is safe, if relevant
be short and sweet — one or two lines is perfect
have a full stop at the end