How to wait something

I try waiting a function,but the process make an error "Cannot wait on monitors on this runtime."
See the following example.

public class Seth(){
    main(){
        molding = "a = Utility.Readline_core("a")"
        var u = new Utility();
        var runtime = Python.CreateRuntime();
        runtime.IO.SetInput(new MemoryStream(), Encoding.Default);
        var eng = Python.GetEngine(runtime);
        var scope = eng.CreateScope();
        scope.SetVariable("Utility", u);
        var source = eng.CreateScriptSourceFromString(molding);
        eng.Execute(molding, scope);
    }
}

public class Utility
{
    private static async Task<string> Readline_core(object m = null)
    {
        if (m != null || m != string.Empty)
        {
            oncheng_input(m.ToString());
        }
        else
        {
            oncheng_input("何かを入力してください");
        }
        while (true)
        {
            if (import_temp != string.Empty)
            {
                Console.WriteLine(import_temp);
                break;
            }
            await Task.Delay(1000);
        }
        var result = import_temp;
        import_temp = string.Empty;
        return result;
    }
}

Here is Error

System.PlatformNotSupportedException: Cannot wait on monitors on this runtime. at System.Threading.Monitor.ObjWait(Int32 millisecondsTimeout, Object obj) at
 System.Threading.Monitor.Wait(Object obj, Int32 millisecondsTimeout) at 
System.Threading.ManualResetEventSlim.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken) at 
System.Threading.Tasks.Task.SpinThenBlockingWait(Int32 millisecondsTimeout, CancellationToken cancellationToken) at 
System.Threading.Tasks.Task.InternalWaitCore(Int32 millisecondsTimeout, CancellationToken cancellationToken) at 
System.Threading.Tasks.Task.InternalWait(Int32 millisecondsTimeout, CancellationToken cancellationToken) at 
System.Threading.Tasks.Task`1[[System.String, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].GetResultCore(Boolean waitCompletionNotification) at 
System.Threading.Tasks.Task`1[[System.String, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].get_Result() at
Ferrum.Utility.Input(String mess) in C:\Users\takum\Git\GitHub\Iron_ide\BlazorApp1\Ide\scripts\Seth.cs:line 200 at Microsoft.Scripting.Interpreter.FuncCallInstruction`2[[System.String, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.String, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].Run(InterpretedFrame frame) at Microsoft.Scripting.Interpreter.Interpreter.Run(InterpretedFrame frame) at 
Microsoft.Scripting.Interpreter.LightLambda.Run4[CallSite,CodeContext,Object,Object,Object](CallSite arg0, CodeContext arg1, Object arg2, Object arg3) at System.Dynamic.UpdateDelegates.UpdateAndExecute3[CodeContext,Object,Object,Object](CallSite site, CodeContext arg0, Object arg1, Object arg2) at 
Microsoft.Scripting.Interpreter.DynamicInstruction`4[[IronPython.Runtime.CodeContext, IronPython, Version=3.4.0.0, Culture=neutral, PublicKeyToken=7f709c5b713576e1],[System.Object, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.Object, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.Object, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].Run(InterpretedFrame frame) at 
Microsoft.Scripting.Interpreter.Interpreter.Run(InterpretedFrame frame) at 
Microsoft.Scripting.Interpreter.LightLambda.Run2[CodeContext,FunctionCode,Object](CodeContext arg0, FunctionCode arg1) at 
IronPython.Compiler.PythonScriptCode.RunWorker(CodeContext ctx) at IronPython.Compiler.PythonScriptCode.Run(Scope scope) at 
IronPython.Compiler.RuntimeScriptCode.InvokeTarget(Scope scope) at IronPython.Compiler.RuntimeScriptCode.Run(Scope scope) at 
Microsoft.Scripting.SourceUnit.Execute(Scope scope, ErrorSink errorSink) at Microsoft.Scripting.SourceUnit.Execute(Scope scope) at 
Microsoft.Scripting.Hosting.ScriptSource.Execute(ScriptScope scope) at Microsoft.Scripting.Hosting.ScriptEngine.Execute(String expression, ScriptScope scope) at Ferrum.Coder.Mold() in C:\Users\takum\Git\GitHub\Iron_ide\BlazorApp1\Ide\scripts\Seth.cs:line 80

What can I do to fix this problem

Start with the embedded execution path in Seth.cs around lines 80 and 200, especially Utility.Readline_core and the Task.Result access shown in the trace. Reproduce the failure with the provided IronPython runtime setup and determine whether the wait is supported in this runtime. Done means the cause and a compatible resolution or confirmed runtime limitation are documented.