Here are details :
When I try to call function "tell" from a chatbox, with all parameters, it yells that :

The whole command is

    p = peripheral.wrap("left")
    p.tell("Pyeroh", "MLP", 10, true, "Test")

I'm on a Chatty Turtle, but it happens also with a Chatbox and a computer.

For now, you could fix it by not including the last argument

Wow, such fix 🐕
By the way, it doesn't work : when I add this boolean, this exception is thrown =/

Thank you for your correction =)