Vague error message for `at` command with invalid type

[Nauxe]

Error given does not match expectations of the user. The user is given the error message telling them that the command format is incorrect, but may be instead due to invalid inputs being put into the parameters instead.

This is medium severity due to users commonly mistyping due to fast typing speeds and possibly entering in a wrong input wondering what is wrong.

[nus-se-script]

Team's Response

Thanks for your response, however, the error message is working as intended due to the presence of an index in your input command.

As mentioned in our UG, users were advised to read the section on "Command Breakdown".

Through the command breakdown section, we had explicitly explained the difference in (ARGUMENT) and (PREFIXES).

Therefore, it is reasonable to expect users to follow the command instruction by add with no index, as by providing an index, it is not complying to the expected command format. Thus, this falls under an invalid command format.

Items for the Tester to Verify

:question: Issue response

Team chose [response.Rejected]

• [ ] I disagree

Reason for disagreement: [replace this with your explanation]

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## :question: Issue severity Team chose [`severity.Low`] Originally [`severity.Medium`] - [ ] I disagree **Reason for disagreement:** [replace this with your explanation]

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