ASA5505 configurate vpn/firewall

[Buss]

I need help configuring the ASA555 on cisco packet tracer 

problem:

Interface address is not on the same as DHCP pool

ERROR:IP address command failed

[Marvin Rhoads]

If you've configured a DHCP pool on a given interface you cannot then change the interface to be on a different subnet.

Either delete the pool first of change the interface address to match.