【V2】the last V2 vision seems not include the new function “HotString()”

[MrBack]

【V2】the last V2 vision seems not include the new function “HotString()”
while I use the latest V2 version write a script which using a HotString() function, an error occurs like this

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text.ahk
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Error: Call to nonexistent function.

Specifically: hotstring(key,replacement)

Line#
002: key := "::wo"
003: replacement := "we open it"
---> 004: hotstring(key,replacement)
005: Return
006: Exit

The program will exit.
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确定
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a script sample like this:
#singleinstance force
key := "::wo"
replacement:="we open it"
hotstring(key,replacement)
return

Note:
I tried this in win7 win10, it just appears the same error