Saving and reloading should clear that error. It usually means the game thinks you have a non-residential lot open for editing somewhere and won't let you (or the game camera) inside of your own active lot properly at the same time.
The other way is with MasterController try MC > Open on the residential lot. Shouldn't be necessary under ordinary gameplay, the lot you are playing on should already be "open" automatically, but the command might get you past where you are stuck. If Open doesn't appear on the lot menu, try Close and then Open immediately after.