My code is saying the message of Special characters must be escaped and I don’t understand what it means. Could someone please help me with what to do here?
hi @Maliha_Irfan - that first red underline is probably because you have that / there in an opening a-plane tag, and also you are missing the - in that closing a-plane tag. this is causing the editor to not recognize these as tags but see the brackets as special characters.
Welcome to the community! 
The rotation shouldn’t have a " before it. Neither should width or height. And then color needs one right after the = sign. Hope this helps! 
You’re currently starting the a-plane element with a closing tag instead of an opening tag and then there’s a bunch of quote issues, so:
- remove that
/at the start of</a-plane position......>, rotation=....has a rogue " in front of it, so remove that, andcolor=#7BC8A"4>is missing an opening quote, and has the closing quote in the wrong place. That should probably becolor="#7BC8A4">- the closing tag should be
</a-plane>, not</a plane>
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