Hi I have a strange error, how do I fix it?

Hello guys
I wanted to add a roof but I didn't like it and the problem is that I can't remove it and I don't know how to fix it

Error name: Unable to remove this structure as it is the only support for Maple Courtyard Roof I.

Please help me fix the error
Screenshot_2025-03-07-08-24-06-97_dac7cc7571c39b392df64923967cf7da.jpg
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