How do i resolve UnityException: get_isActiveAndEnabled can only be called from the main thread ?

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Hi guys

I am converting a C# SDK to unity it uses dll files , i put them in plugins folder. when i click connect button ( btnConnect_Click void ) i get this error " UnityException: get_isActiveAndEnabled can only be called from the main thread." in the first time i open unity , then the code only gives me (1)(connection type method ) in txtmsg .

Here is my script file

 using UnityEngine;
 using SunVoteSDK;
 using System;
 using System.Linq;
 using UnityEngine.UI;
 using System.Runtime.InteropServices;
 
 public class voting : MonoBehaviour {
     SunVoteDll SunVote = null;
     public SunVoteDll.ConnectEventCallbackDelegate cecd;
     public SunVoteDll.HDParamEventCallbackDelegate hdpecd;
     public SunVoteDll.VoteEventCallbackDelegate vecd;
     public SunVoteDll.KeyEventCallbackDelegate kecd;
     public Text txtMsg;
     public Text txtPar;
     void Start()
     {
         if (SunVoteDll.Is64Exe())
         {
             SunVote = new SunVoteDll64();
             Debug.Log("64");
         }
         else
         {
             SunVote = new SunVoteDll();
             Debug.Log("32");
         }
         txtMsg.text = SunVote.LicenseA(1, "SUNARS2013").ToString();
 
 
 
         //若用下面模式绑定事件，多点几次按钮会报错：对象已释放
         //SunVote.SetConnectEventCallBackA(ConnectEventCallBackFunction);
         //SunVote.SetVoteEventCallBackA(VoteEventCallBackFunction);
         //SunVote.SetKeyEventCallBackA(KeyEventCallBackFunction);
         //SunVote.SetHDParamEventCallBackA(HDParamEventCallbackFunction);
 
         cecd = new SunVoteDll.ConnectEventCallbackDelegate(ConnectEventCallBackFunction);
         hdpecd = new SunVoteDll.HDParamEventCallbackDelegate(HDParamEventCallbackFunction);
         vecd = new SunVoteDll.VoteEventCallbackDelegate(VoteEventCallBackFunction);
      //   kecd = new SunVoteDll.KeyEventCallbackDelegate(KeyEventCallBackFunction);
 
         SunVote.SetConnectEventCallBackA(cecd);
         SunVote.SetHDParamEventCallBackA(hdpecd);
         SunVote.SetVoteEventCallBackA(vecd);
         SunVote.SetKeyEventCallBackA(kecd);
 
     }
 
     public void HDParamEventCallbackFunction(int iBaseID, int iMode, string sInfo)
     {
         
             txtMsg.text += "HDParamEventCallbackFunction  iBaseID=" + iBaseID +
                                                          "  iMode=" + iMode +
                                                          "  sInfo=" + sInfo + "\r\n";
             Debug.Log( sInfo);
           
        
 
     }
     public void KeyEventCallBackFunction(int iBaseID, int KeyID, string keySN, int iMode, float Time, string sInfo)
     {
        
             string s = "VoteEventCallBackFunction  BaseID=" + iBaseID +
                                                     "  KeyID=" + KeyID +
                                                     "  iMode=" + iMode +
                                                     "  Time=" + Time +
                                                     "  sInfo=" + sInfo + "\r\n";
             //this.txtMsg.text += s;            
             txtMsg.text += s;
          
        
 
     }
 
 
     public void ConnectEventCallBackFunction(int iBaseID, int iMode, string sInfo)
     {
             txtMsg.text += "Connect_onConnectEventCallBack  iBaseID=" + iBaseID +
                                                            "  iMode=" + iMode +
                                                            "  sInfo=" + sInfo + "\r\n";
 
        
 
 
     }
 
     public void VoteEventCallBackFunction(int iBaseID, int iMode, string sInfo)
     {
       
             txtMsg.text += "VoteEventCallBackFunction  iBaseID=" + iBaseID +
                                                       "  iMode=" + iMode +
                                                       "  sInfo=" + sInfo + "\r\n";
          
       
 
     }
 
 
   
     public void btnConnect_Click()
     {
         try
         {
              
 
     int a=SunVote.ConnectA((int)SunVoteDll.ConnectType.conn_type_usb, "");
            txtMsg.text += "\r\n";
 
         }
         catch (Exception ex)
         {
             txtMsg.text += ex.ToString();
         }
     }
 
     public void btnStart_Click()
     {
         try
         {
             int n = SunVote.VoteStartA((int)SunVoteDll.VoteType.VoteType_Choice, "1,1,0,0,10,1");
             txtMsg.text += n.ToString() + "\r\n";
         }
         catch (Exception ex)
         {
             txtMsg.text += ex.ToString();
         }
     }
 
 
     public void btnDisconnect_Click()
     {
         try
         {
             int n = SunVote.DisconnectA(0);
             txtMsg.text += n.ToString() + "\r\n";
         }
         catch (Exception ex)
         {
             txtMsg.text += ex.ToString();
         }
     }
 
     public void btnReadHDParam_Click()
     {
         try
         {
             int n = SunVote.ReadHDParamA(0, (int)SunVoteDll.ParamType.BaseStation_Channel);
             txtMsg.text += n.ToString() + "\r\n";
         }
         catch (Exception ex)
         {
             txtMsg.text += ex.ToString();
         }
     }
 
     public void btnWriteHDParam_Click()
     {
         try
         {
             int n = SunVote.WriteHDParamA(0, (int)SunVoteDll.ParamType.BaseStation_Channel, txtPar.text);
             txtMsg.text += n.ToString() + "\r\n";
         }
         catch (Exception ex)
         {
             txtMsg.text += ex.ToString();
         }
     }
 
     public void btnStartTest_Click()
     {
         try
         {
             int n = SunVote.VoteStartA((int)SunVoteDll.VoteType.VoteType_KeyPadTest, "2,0,1");
             txtMsg.text += n.ToString() + "\r\n";
         }
         catch (Exception ex)
         {
             txtMsg.text += ex.ToString();
         }
     }
 
     public void btnStopTest_Click()
     {
         try
         {
             int n = SunVote.VoteStopA();
             txtMsg.text += n.ToString() + "\r\n";
         }
         catch (Exception ex)
         {
             txtMsg.text += ex.ToString();
         }
     }
 
    
 }

and here is the sunvote 64 class

 //using System;
 //using System.Collections.Generic;
 //using System.Linq;
 //using System.Text;
 //using System.Threading.Tasks;
 using System.Runtime.InteropServices;
 
 
 namespace SunVoteSDK
 {
     public class SunVoteDll64 : SunVoteDll
     {
 
         private const string DllPath = "Assets/Plugins/sunvote_android/SunVoteSDK_x64.dll";
 
         [DllImport(DllPath, CallingConvention = CallingConvention.Cdecl)]
         private static extern int Connect(int iMode, string sParam);
         public override int ConnectA(int iMode, string sParam)
         {
             
             return Connect(iMode, sParam);
         }
 
         [DllImport(DllPath, CallingConvention = CallingConvention.Cdecl)]
         private static extern int Disconnect(int baseId);
         public override int DisconnectA(int baseId)
         {
             return Disconnect(baseId);
         }
 
         [DllImport(DllPath, CallingConvention = CallingConvention.Cdecl)]
         private static extern int WriteHDParam(int BaseID, int iMode, string sSetting);
         public override int WriteHDParamA(int BaseID, int iMode, string sSetting)
         {
             return WriteHDParam(BaseID, iMode, sSetting);
         }
 
         [DllImport(DllPath, CallingConvention = CallingConvention.Cdecl)]
         private static extern int ReadHDParam(int BaseID, int iMode);
         public override int ReadHDParamA(int BaseID, int iMode)
         {
             return ReadHDParam(BaseID, iMode);
         }
 
         [DllImport(DllPath, CallingConvention = CallingConvention.Cdecl)]
         private static extern int VoteStart(int iMode, string sSetting);
         public override int VoteStartA(int iMode, string sSetting)
         {
             return VoteStart(iMode, sSetting);
         }
 
         [DllImport(DllPath, CallingConvention = CallingConvention.Cdecl)]
         private static extern int VoteStop();
         public override int VoteStopA()
         {
             return VoteStop();
         }
 
         [DllImport(DllPath, CallingConvention = CallingConvention.Cdecl)]
         private static extern int License(int Mode, string sInfo);
         public override int LicenseA(int Mode, string sInfo)
         {
             return License(Mode, sInfo);
         }
 
         [DllImport(DllPath, CallingConvention = CallingConvention.Cdecl)]
         private static extern void SetConnectEventCallBack(ConnectEventCallbackDelegate ConnectEventCallback);
         public override void SetConnectEventCallBackA(ConnectEventCallbackDelegate ConnectEventCallback)
         {
             SetConnectEventCallBack(ConnectEventCallback);
         }
 
         [DllImport(DllPath, CallingConvention = CallingConvention.Cdecl)]
         private static extern void SetHDParamEventCallBack(HDParamEventCallbackDelegate HDParamEventCallback);
         public override void SetHDParamEventCallBackA(HDParamEventCallbackDelegate HDParamEventCallback)
         {
             SetHDParamEventCallBack(HDParamEventCallback);
         }
 
         [DllImport(DllPath, CallingConvention = CallingConvention.Cdecl)]
         private static extern void SetVoteEventCallBack(VoteEventCallbackDelegate VoteEventCallback);
         public override void SetVoteEventCallBackA(VoteEventCallbackDelegate VoteEventCallback)
         {
             SetVoteEventCallBack(VoteEventCallback);
         }
 
         [DllImport(DllPath, CallingConvention = CallingConvention.Cdecl)]
         private static extern void SetKeyEventCallBack(KeyEventCallbackDelegate KeyEventCallback);
         public override void SetKeyEventCallBackA(KeyEventCallbackDelegate KeyEventCallback)
         {
             SetKeyEventCallBack(KeyEventCallback);
         }
     }
 }

How do i resolve UnityException: get_isActiveAndEnabled can only be called from the main thread ?

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