Alpine Expression Error: Cannot set properties of null (setting _x_dataStack)

If you ran into the above error before, one of the most common causes is forgetting to define exactly one root element.

So, if your code looks like this:

<template x-if="loading"> Loading... </template>

You need to change it to this (instead of a div you may use any other valid HTML element):

<template x-if="loading">
	<div>Loading...</div>
</template>

As stated in the Alpine.js docs, template tags may only contain one root element, and text in itself does not qualify as an element.