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Now first you need to check if your document Id which you get through document.getElementById() is correct. This string must be correct one.
It's same for the querySelector.
One big reason it happens due to DOM object is not ready, which means your document ID doesn't exist in the DOM at the moment of execution of this code.
So move it to the right place and don't put in the <head></head> tag section.
Try copying your
<script>code</script> right before the
React Native tutorial with Nodejs restful api