RouterOS winbox error

When I try to connect to my new router board RB411AR I get this message ( COULD NOT GET routerOS.dll : no reply) plz how can this issue be resolved. I need help. I searched the wiki and no info on this.

Thank you.

Re-install via Netinstall. The wiki explains how to do that.

which wiki?

http://wiki.mikrotik.com/wiki/Manual:Netinstall