Error invoking activity from custom library

Hi,
I am currently using System.Net.HttpClient to communicate with JIRA.

Code example:


    Dim client As System.Net.Http.HttpClient = New System.Net.Http.HttpClient()
	client.BaseAddress = New Uri(uri)
	client.DefaultRequestHeaders.Accept.Clear()
	client.DefaultRequestHeaders.Accept.Add(New System.Net.Http.Headers.MediaTypeWithQualityHeaderValue("application/json"))
	client.DefaultRequestHeaders.Authorization = New System.Net.Http.Headers.AuthenticationHeaderValue("Basic", token)
	
	Dim request As System.Net.Http.HttpRequestMessage = New System.Net.Http.HttpRequestMessage(HttpMethod.Post, "rest/api/2/issue")

	'Body
	request.Content = New StringContent(JsonString, System.Text.Encoding.UTF8, "application/json")

	response = client.SendAsync(request).Result

Examples of working code here:

If I create solutions on RestSharp, I use the library version 106.15.0