Код: Выделить всё
1. The primary reference "xxx" could not be resolved because it was built against the ".NETFramework,Version=v4.5" framework. This is a higher version than the currently targeted framework ".NETFramework,Version=v3.5".
2. The type or namespace name 'xxx' could not be found (are you missing a using directive or an assembly reference?)
Подробнее здесь: https://stackoverflow.com/questions/198 ... ently-targ