Dll Issues after bulid in mvc 4

Question

  Hi  every One,

 

i  faced one problem , in my project  when am bulid its automatically failed, but Refrences  Avalible Dll 's but error came

 

 

 

Error 10 The type or namespace name 'Business' does not exist in the namespace 'SUM.OLS.Intranet' (are you missing an assembly reference?)

 am doing Rebulid and Clean solution  all are Doing , but Am not Success , Any one help me.