What do I do if I get the error "WHMCS Kayako v4 Module Error: The local license key has been tampered with or is invalid."

What do I do if I get the error "WHMCS Kayako v4 Module Error: The local license key has been tampered with or is invalid." ?

Please empty the file aiso-Kayako-license.dat in the includes folder so its 0 bytes.

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