dynamics crm - Error with OutParameter in custom Action -

there error: the type outargument`1 of property result not supported. , there code

 [output("result")]   public outargument<entitycollection> result { get; set; } 

i error when try update assembly. ideas?

you cannot use type entitycollection in generic outargument<t> properties.

supported types are:

• boolean
• datetime
• decimal
• double
• entityreference
• int32
• money
• optionsetvalue
• string

see msdn.