ERROR: System.Xml.XmlException: 'Name cannot begin with the '<' character, hexadecimal value 0x3C RRS feed

  • Question

  • Whenever I try to send a POST request to my API it gives me this error in my WPF application. I've tried to search for "<<<" in my application but there were no results for this. I've been trying to fix this issues for several days, but with no luck.

    This is my back-end of my WPF page:
                // create new restclient class, with the base url filled in the ()
                var client = new RestClient("http://thewebsite.com");
                //  create new restrequest class, withe the rest of the url we want filled in
                var request = new RestRequest("/api/v2/projects");
                string title = Title.Text;
                string description = Description.Text;
                string deadline = Deadline.Text;
                // add the content here: user is automatically created related to the api token, they will be the owner. 
                request.AddBody(new { title = title, description = description, deadline = deadline});
                request.Method = Method.POST;
                request.AddHeader("Accept", "application/json");
                client.AddDefaultHeader("Authorization", string.Format("Bearer {0}", Global.ApiToken));
                // we execute and get the content
                var response = client.Execute(request);
                if (response.StatusCode.ToString() == "OK" || response.StatusCode.ToString() == "200")
                else if (response.StatusCode.ToString() == "422")
                    MessageBox.Show("NOT OK");
                else if (response.StatusCode.ToString() == "401")

    The front end (XAML):
    <UserControl x:Class="Prototype.Projects.ProjectCreate"
                 d:DesignHeight="570" d:DesignWidth="830">
        <!-- whole projects grid -->
                <RowDefinition Height="51*" />
                <RowDefinition Height="55*" />
                <RowDefinition Height="Auto" MinHeight="464"/>
                <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                    <GradientStop Color="#FFA0A0A0" Offset="1" />
                    <GradientStop Color="#FFDADADA" />
            <!-- Tab Description -->
            <Grid Row="0">
                <TextBlock Margin="10" FontFamily="Century Gothic" FontSize="25" Text="Nieuw Project" />
            <Grid Row="1">
                <TextBlock Margin="10" FontSize="20" FontFamily="century gothic" TextWrapping="Wrap"
                               Text="Voer hieronder de informatie van het project in" Grid.ColumnSpan="3" />
            <!-- Backlog Items -->
            <Grid Row="2">
                        <Label FontFamily="century gothic" Margin="55,10,4,10">Titel</Label>
                        <TextBox FontFamily="century gothic" Background="White" HorizontalAlignment="right"
                                 Margin="0,10,110,10" Width="600" Name="Title" />
                        <Label FontFamily="century gothic" Margin="10,10,38,10">Beschrijving</Label>
                        <TextBox FontFamily="century gothic" Background="White" HorizontalAlignment="right"
                                 Margin="0,10,110,10" Width="600" Height="100" TextWrapping="Wrap" Name="Description"/>
                        <Label FontFamily="century gothic" Margin="25,10,20,10">Deadline (2020-01-15 00:00:00)</Label>
                        <TextBox FontFamily="century gothic" Background="White" HorizontalAlignment="right"
                                 Margin="0,10,562,10" Width="148" Name="Deadline"/>
                        <!-- -->
                        <Button x:Name="Create_Project_Button" FontFamily="century gothic" VerticalAlignment="Bottom" HorizontalAlignment="Right"
                                Width="250" Margin="0,0,110,13" Click="Create_Project_Button_Click">
                            <TextBlock FontFamily="century gothic">Project aanmaken</TextBlock>
                    <!-- -->
                    <!-- -->
                <!-- -->
                <!-- -->

    Monday, March 16, 2020 1:12 PM

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