Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.

'MockedRequestExtensions.Respond(MockedRequest, HttpResponseMessage)' is obsolete: 'Using this overload is not recommended. Instead, use Respond(req => new HttpResponseMessage(...))'

'MockedRequestExtensions.Respond(MockedRequest, HttpResponseMessage)' is obsolete: 'Using this overload is not recommended. Instead, use Respond(req => new HttpResponseMessage(...))'

Possible null reference argument for parameter 'learningContent' in 'LearningElementPe.LearningElementPe(string name, ILearningContentPe learningContent, string description, string goals, LearningElementDifficultyEnum difficulty, ElementModel elementModel, int workload = 0, int points = 1, double positionX = 0, double positionY = 0)'.

Because this call is not awaited, execution of the current method continues before the call is completed. Consider applying the 'await' operator to the result of the call.

Non-nullable property 'StoryEle1' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Non-nullable property 'StoryEle2' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Non-nullable property 'Ele1' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.