Special characters for topic addresses

Dear Community

I just started learning Solace and I'm doing hands-on from the Solace Essentials training course.

Although I was instructed to create a topic address like below,

<YOUR_NAME>/rideshare/ride/accepted/2.0.5/{location}/json/{customer_id}/{request_id}/{driver}

it gives me an error when I try to download a AsyncAPI schema file for my application.

"The event XXX has a topic that is not supported by the AsyncAPI specification. Topic addresses must only contain letters, numbers and one or more of the following special characters: !#$&()*+,-./:;=[]_~"

Am I not supposed to use { } or what's the cause?

By the way I can only choose the question category either General Discussion or Early Access API.