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[noituri]

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[R3CKhi]

hi

[blender-dev]

Hello

[CoconutNeko]

[priyanuj-gogoi]

This should solve your issue:

$nomention
$username[$mentioned[1]]#$discriminator[$mentioned[1]]

For more reference, checkout the $username wiki.

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[priyanuj-gogoi]

You received the error because you haven't mentioned a user. Mentioning a user should fix the issue.

Now, let's suppose...you don't want the error to pop or want a custom error.
Then, use $onlyIf[] function with a condition to check if the author has mentioned a user.

Here's an example,

$nomention
$onlyIf[$mentioned[1]!=;You need to mention an user!]
$username[$mentioned[1]]#$discriminator[$mentioned[1]]