Why the router prompts "CONFIG_RESOLVE_FAILURE"?
 

I'm using Dynamips for my ccna lab, but I always get an error message on RouterB. Anyone knows the reason, and how to turn it off? Thanks in advance.
http://www.netbraintech.com/share/An_error_message.gif

My reply
 

This error message is related to the default service configuration option built into Cisco IOS software, which attempts to access the service configuration files from a network Trivial File Transfer Protocol (TFTP) server.

In order to disable this feature, issue the no service config global command.
Router#config terminal
Enter configuration commands, one per line.
Router(config)#no service config
Router(config)#exit
Router#copy running-config startup-config

This error message will no longer appear at the next reboot of the router.

Thanks
 

The message disappeared, thanks.