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After upgrading to K2 4.7, when you deploy the K2 for SharePoint App from the App Catalogue to a site collection or activate the app on a site collection, a warning Red exclamation mark is displayed but contains no error message. In debug mode a Protocol Violation error is thrown.
The following error message occurs: <Exception ExtendedDetail="T" Title="Error" Description="An exception has occurred."><Type Name="Type">SourceCode.SmartObjects.Client.SmartObjectException</Type><Message Name="Message">The server committed a protocol violation. Section=ResponseStatusLine
- Ensure you have K2 4.7 installed.
- Download and Install the K2 4.7 May 2017 Cumulative Update from K2 Partner and Customer Portal.
- the K2 4.7 May 2017 Cumulative Update FP3 from Regional Support
- Install the K2 4.7 May 2017 Cumulative Update FP3 to apply the fix.
Set your Host Server logging level to warning as Retry logic has been built in. Retries are logged as warnings.