Proper function call

Design help Custom code
1

I am building an AMP form with a button to invoke my function and I get the following error:

[Action] Target (SCRIPT) doesn't support "send" action.​​​ <button class="button i-amphtml-error" on="tap:quoteFormScript.send">

According to the documentation the call to a function should be:

eventName:targetId[.methodName[(arg1=value, arg2=value)]]

This my code with relative and full path to target(both fail):

<form action-xhr="https://example.com/quote" method="post" accept-charset="utf-8" id="quoteForm">
<form action-xhr="/quote" method="post" accept-charset="utf-8" id="quoteForm">
<button on = "tap:quoteFormScript.send" class="button">Send</button>
</form>

<script id="quoteFormScript" type="text/plain" target="amp-script">
function send(){
   alert("Send");
}
</script>

I have tried:

<button on = "tap:quoteFormScript.send" class="button">Send</button>
<button on = "tap:quoteFormScript.send()" class="button">Send</button>

Any ideas?

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