My Vigor 2850VN router keeps asking me to Please remove the Dual DSL adapter

1. its not plugged in
2. the router is not configured to use anything other than WAN1 (WAN2 and 3 are disabled) Enable Dual DSL is not ticked.

Any ideas?
Alan.

Sorry i am not trying to change settings ... but i have enable 2 wan's - but not the dual wan - and all times it will appear the massage again after changing's at
WAN >> General Setup page, so ...
It seems is appearing by default because i am not using the dual wan either

If you with one wan enable was not appearing before it may be a bug ... but if is from the begin like this, that's how is suppose to be