[what is a simulator...and why isnt it letting me in?]

this Simulator thingie is not letting me into my account...how in the world do i get it fixed?

 

[I Can't Log in to my Main Avatar error message pops up saying can not connect to simulator]

i have joined this group lastnight and im getting that meassgae about cant find simulator...i can even get into any of my alts....HELPPP!!!!