Following "Create a blog" and get error message "chunk name is invalid"

I’m following this tutorial:

I’m stuck at the paragraph about the “jumbotron-modDocument” and I get an error message which says:

chunk name is invalid
I cannot figure out what’s wrong with the name. Any suggestions?

There seems to be a space as the first character of the chunk name. Delete it.

Right on the nail. I’m embarrassed I didn’t see it. Thanks htd.

To be honest the error message could be a better indicator of what’s wrong! I wouldn’t have noticed it either if I didn’t look at the example on how to call the chunk. It’s also not clear in what characters aren’t allowed and which are.

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