Await error: description
One of the following problems occurred:
- The version of the .NET Framework being used is lower than 4.5. ASYNC and AWAIT support is only available when compiled and run against Framework 4.5 or higher.
- The path to which AWAIT is applied is not Task or Task<0>, and no GetAwaiter method was found within the expression’s class or interface.
- AWAIT is being used in a method that’s not declared as ASYNC.