GNS3 error : ip nat inside

When i try to configrue NAT, #ip nat inside or outside, I got the following errors


% NBAR ERROR: due to memory problem, parsing stopped
% NBAR Error : Activation failed due to insufficient dynamic memory
% NBAR Error: Stile could not add protocol node 
%NAT: Error activating CNBAR on the interface Serial0/0


to solve the problem, I expand router's RAM size(for example, upto 256M)



- Right click on your router
- Select Configure
- Click on the Router name in the Left hand pane
- Click the Memories and Disks tab



- change the RAM size to 256M

and then save configuration and reload...


thank you...