This site is being deprecated.
Please see the official X‑Plane Support page for help.
The airfoil file may be missing a value. Additional checks were added towards the end of the X-Plane 10 run so we started seeing some issues with airfoils with 0 values. Is this airfoil part of a third party plane perhaps? Can you figure out what plane it belongs to and modify the file?
Otherwise, running the latest X-Plane 10 installer and picking the update option should find any corrupt default files. Note that you will want to pick the "overwrite" option if X-Plane asks for confirmation.
This site is no longer being actively maintained.