Unhandled Exception System.Runtime.InteropServices.COMException (0x0000026B) when reading SAPGUI label occurred in mscorlib.dll

I am currently automating a SAP GUI tool to get the response time of a tcode via STAD. I tried in first in VBA Excel and it works fine. But upon migrating to Visual Studio 2013, it encounters below unhandled exception:

Line of code:

        If statusbar_msg = "" Then
            jmsession.FindById("wnd[0]/tbar[0]/okcd").Text = "/nstad"
            jmsession.FindById("wnd[0]").sendVKey(0)
            jmsession.FindById("wnd[0]/usr/txtSELECTION-SREADTI").Text = "00:20:00"
            jmsession.FindById("wnd[0]/usr/txtSELECTION-SBENU").Text = Form1.TextBox1.Text
            jmsession.FindById("wnd[0]/usr/txtSELECTION-STCOD").Text = tcode(i, 1)
            jmsession.FindById("wnd[0]/usr/txtSELECTION-STCOD").SetFocus()
            jmsession.FindById("wnd[0]").sendVKey(0)

            res_Time_ms = jmsession.FindById("wnd[0]/usr/lbl[113,9]").Text

jmsession.FindById("wnd[0]/usr/lbl[113,9]").Text ---> in this line an exception is thrown.

The rest of the code works except for this line.

Below is the exception:

An unhandled exception of type 'System.Runtime.InteropServices.COMException' occurred in mscorlib.dll

Additional information: The control could not be found by id.

When executed using CTRL+F5

************** Exception Text ************** System.Runtime.InteropServices.COMException (0x0000026B): The control could not be found by id. at System.RuntimeType.ForwardCallToInvokeMember(String memberName, BindingFlags flags, Object target, Int32[] aWrapperTypes, MessageData& msgData) at SAPFEWSELib.ISapSessionTarget.FindById(String Id, Object Raise)