A colleague had this error occur while setting up a production system. Everything had been fine in development, but Dependency Injection seemed to be throwing a wobbly when it tried to load the service we’d written for adding/removing contacts from a subscription list.

Edit: I raised this problem with Sitecore and got a helpful response: https://andrewwburns.com/2018/08/17/avoiding-the-iclientapiservice/

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