CCL: AIM analysis - Error in CO-value. How to solve it?

 Sent to CCL by: Tymofii Nikolaienko [tim_mail(_)]
 You can try AimAll
 27.11.2018 12:03, Kavitha Velappan kavitha.velappan{=}
 Sent to CCL by: "Kavitha  Velappan" [kavitha.velappan*_*]
 I have optimized the structure of a metal complex. I have also done
 wavefunction calculation. When I try to open the .wfn file I am getting the
 following message "error in CO-value". Also suggest a free and user-
 friendly software that would be an alternative to AIM2000.>