ASNCERR

991

Async error: description

One of the following problems occurred:

• A hoisting error occurred within the body of an ASYNC method.
• The method returned an invalid return type.

An ASYNC method cannot contain any of the following:

• A field that is a member of group or a named record
• A field that overlays or is overlayed by another field
• A parameter that is BYREF, OUT, INOUT, or a parameter group
• A return type other than void, Task, or Task<>