Impossible to invoke a method ("resize") on a null variable.
<div id="anmeldung" class="relative py-10 overflow-hidden bg-brand-400">
<div class="wrapper">
<div class="absolute inset-0 z-0 object-cover h-full">
<ken-burns-carousel class="absolute inset-0"
images="{{ page.signupbgimage.toFile.resize(1280).url }}
{{ page.signupbgimage.toFile.resize(1280).url }}">
</ken-burns-carousel>
</div>
<div class="absolute inset-0 z-0 bg-blue opacity-80"></div>
<div class="relative px-4 py-16 text-center sm:py-20 sm:px-6 lg:px-8">