Variable is not declared. It may be inaccessible due to its protection level

So i made my own Custom NativeActivity and it worked as expected untill i tried putting Itself as a childActivity. Now i get this Error.

Full text : The private implementation of Activity ‘1.14: Time agent’ has the following validation error: Compile error encountered processing expressing ‘table’
Variable is not declared. It may be inaccessible due to its protection level.

workflow%20variables
As seen the variable is declared. and it also work when my activity doesn’t contain the a copy of itself.
seqsucc
Instantiating a new Table, errorstate and title for the innner sequence still raises the same error.
resultsucc

Anyone have any clues to what could be the cause ?

public class TimeAgent : NativeActivity
{
    private Stopwatch stopwatch;

    private Sequence innerSequence = new Sequence();

    [Browsable(false)]
    public Collection<Activity> Activities
    {
        get
        {
            return innerSequence.Activities;
        }
    }

    [Browsable(false)]
    public Collection<Variable> Variables
    {
        get
        {
            return innerSequence.Variables;
        }
    }
    
    private string value_taskname = "Title";
    private string value_elapsedtime = "Time";

    [Category("Input")]
    [RequiredArgument]
    public InArgument<DataTable> DataTable { get; set; }

    [Category("Input")]
    [RequiredArgument]
    public InArgument<string> Title { get; set; }

    [Category("Input")]
    [RequiredArgument]
    public InArgument<bool> ErrorState { get; set; } 
    

    protected override void CacheMetadata(NativeActivityMetadata metadata)
    {
        God.AddStopwatch();
        stopwatch = God.GetStopwatch();
        metadata.AddImplementationChild(innerSequence);

        RuntimeArgument argErrorState = new RuntimeArgument("RTA_ErrorState", ErrorState.ArgumentType, ArgumentDirection.In);
        metadata.Bind(ErrorState, argErrorState);
        metadata.AddArgument(argErrorState);

        RuntimeArgument argDataTable = new RuntimeArgument("RTA_DataTable", DataTable.ArgumentType, ArgumentDirection.In);
        metadata.Bind(DataTable, argDataTable);
        metadata.AddArgument(argDataTable);

        RuntimeArgument argTaskname = new RuntimeArgument("RTA_Taskname", Title.ArgumentType, ArgumentDirection.In);
        metadata.Bind(Title, argTaskname);
        metadata.AddArgument(argTaskname);
    }
    
    protected override void Execute(NativeActivityContext context)
    {
        bool errorstate = ErrorState.Get(context);
        if (!errorstate)
        {
            InstantiateDatatableColumns(DataTable.Get(context));
            stopwatch.Reset();
            stopwatch.Start();
            context.ScheduleActivity(innerSequence, OnCompleted, OnFaulted);
        }
        else
        {
            DataTable dataTable = DataTable.Get(context);
            dataTable.Rows.Add(Title.Get(context), 0);
        }
    }
    
    private void OnCompleted(NativeActivityContext context, ActivityInstance completedInstance)
    {
        double elapsedtime;
        God.FinishStopwatch(out elapsedtime);
        DataTable dataTable = DataTable.Get(context);
        dataTable.Rows.Add(Title.Get(context), elapsedtime);
    }
    
    private void OnFaulted(NativeActivityFaultContext faultContext, Exception propagatedException, ActivityInstance propagatedFrom)
    {
        stopwatch.Stop();
        faultContext.CancelChild(propagatedFrom);
    }
}

Solved the Issue
This link describes the solution

TL:DR
In CacheMetadata -> Change metadata.AddImplementationChild(innerSequence);
to metadata.AddChild(innerSequence);

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