Erroron on load

[systematicanet]

Updated to the last flask-meld with pip.
I have this error on loading of a page using meld component

Failed to load module script: Expected a JavaScript module script but the server responded with a MIME type of "text/plain". Strict MIME type checking is enforced for module scripts per HTML spec.

And then I'm not able to have a component working (with a previous version it work)

[systematicanet]

this is my code

selectmacroaree.py

class SelectMacroaree(Component):
	def __init__(self,  id=None, **kwargs):
		super().__init__(id=id, **kwargs)
		self.selezionato = kwargs.get('value', '0')
		myresult = listaMacroAreeDict()
		myresult.insert(0,{'id':0, 'text':'Tutte'})
		self.macroaree = myresult

	def set_macroarea(self):
		print(self.selezionato)

selectmacroaree.html

<div>
	<label for="selectmacroaree">Macroaree</label>
	<select meld:model.prevent="selezionato" meld:click="set_macroarea" class="uk-select" id="selectmacroaree" name="selectmacroaree"  >
		{% for macro in macroaree %}
			<option value="{{ macro.id|trim }}">{{ macro.text }}</option>
		{% endfor %}
	</select>
</div>

set_macroarea doesn't work