WHMCS when editing templates, creating emails etc...

Throws the following error:

Validation Error
You must enter a message to send

Check in WHMCS:

Setup / General / Localisation
Default is: urf-8

After an upgrade site move our's was reset to:
iso-8859-1

In which was the cause of the above error. Setting back to default resolve the TinyEditor issue when composing messages in WHMCS

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