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Doesn't install on 8.0.3


I get the following error when installing:
Compilation Error

Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.

Compiler Error Message: BC30002: Type 'HttpResponseMessage' is not defined.

Source Error:

Line 28:
Line 29: <HttpPost> _
Line 30: Public Function Subscribe(Subscriber As SubscriberDTO) As HttpResponseMessage
Line 31: If UserInfo.UserID <> -1 Then
Line 32: ' saving subscribers as a comma-delimited string will accomodate ~500 subscribers for a group - more than adequate for the majority of cases

Source File: D:\Users\bitzb\Documents\visual studio 2015\Projects\School Council\Dnn.Platform-8.0.3\Website\App_Code\DNNCorp\MailingList\MailingListController.vb Line: 30