error is : * Invalid format: $iif
thanking you in advance

Thats not what $iif is for.

$iif returns a value, it's not meant to pipe up commands in it, for that you use /if.

Btw use $read(reasons.txt,tn), it will cause anything read-in to be not evaluated.

I also suggest using $gettok($chan($active).mode,1,32) instead of $chan($active).mode.

For example:
$chan($active).mode = +ntk Query
A channel that has a key that contains Q, and the kick command will try to remove the Q mode

Reply to the correct person please.