large topology error when trying to use thicken function

[greyscott1212]

fusion 360 won't allow me to thicken the walls of my model, only happens when I attempt to thicken certain walls. 

[hamid.sh.]

Please provide more information so forum users can help. Ideally your model exported to *.f3d, or at least some screenshots that include your timeline and browser.

[greyscott1212]

here are some screenshots of the model