How do I fix this error. The shell operation failed to complete.

https://preview.redd.it/6z8458jledsh1.png?width=1230&format=png&auto=webp&s=4e62f009d6751d9f09809e19511ba7ad26ff4271

The shell operation failed to complete. One of the faces may offset into an adjacent face, a small face may need to be eliminated, or one of the faces may have a radius of curvature which is smaller than the shell thickness. Please use Tools Check to find the minimum radius of curvature on appropriate faces. If possible, eliminate any unintended small faces or edges.