flow region could not be created

when i try to create an external flow folume i get this message
The flow region could not be created. Please consider cleanup operations.

how to i fix this

Hi @k420, thanks for posting on the forum and welcome to the SimScale Community :handshake:

Make sure to post your project’s link when creating a forum post - this way when can pinpoint where the problem is more easily. This article might be helpful:

This one might also help in correcting some CAD issues which commonly lead to the error you’ve described:

Cheers,
Igor