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why doesn't not want to work

hello, i'm new to cad and oneshape i'm trying to create fan duct with the loft tool but it doesn't work
and i get error loft did not regenerate properly cannot use faces or regions with inner loops as profiles.
does anyone know what it means and how to fix it


project link: https://cad.onshape.com/documents/0089e658e1ef03088cc51fdc/w/376a0f7110735b20389e1b42/e/b7f0878a3152ce793dfc4ecd?renderMode=0&uiState=65bab25ea775742354f83609
and i get error loft did not regenerate properly cannot use faces or regions with inner loops as profiles.
does anyone know what it means and how to fix it


project link: https://cad.onshape.com/documents/0089e658e1ef03088cc51fdc/w/376a0f7110735b20389e1b42/e/b7f0878a3152ce793dfc4ecd?renderMode=0&uiState=65bab25ea775742354f83609
0
Answers
https://cad.onshape.com/documents/8b2587fbdb3af8ccd7576f18/w/9d2db92826f54a589f9aaf21/e/233c7e531bd75dfaed1472e5