Topic
When trying to access either 'SmartObject OData' or 'Workflow REST' node on K2 Management, the following error message is shown:
The type initializer for 'SourceCode.SmartObjects.Services.WebApiSettings.WebApiSettingsJsonSerializerEndpointFormatter' threw an exception.

Instructions
1. Log a tier escalation to request for correct SourceCode.SmartObjects.Services.WebApiSettings.dll.
2. Stop the K2 Server service.
3. Backup file in location specified below
4. Replace assembly in location specified below
File Name:
SourceCode.SmartObjects.Services.WebApiSettings.dll
File Paths:
[Program Files]\K2\ServiceBroker\
5. Start the K2 Server service.