having trouble adding a button to end session

Hi everyone. I am trying to add a button that will appear after clearing a board in a game. The button is designed to end the level from continuing its process so users don't have to wait for a long time.

Below is some of the code that is calling the button to skip the level. The button name is called: SkipLevelBtn (skip level button).

The skip level button is hidden and then I used a simple show (boolean) to display the button when the target is reached during the game play.

IEnumerator BaseSession () { DebugPanel.Log("Status (Base)", "Session", "Began."); while (!limitationRoutineIsOver && !targetRoutineIsOver) { yield return 0; }

     DebugPanel.Log("Status (Base)", "Session", "Waiting is over.");

     // Checking the condition of losing
     if (!reachedTheTarget) {
         DebugPanel.Log("Status (Base)", "Session", "Session failed. Clearing.");
         yield return StartCoroutine(GameCamera.main.HideFieldRoutine());
         FieldAssistant.main.RemoveField();
         ShowLosePopup();
         DebugPanel.Log("Status (Base)", "Session", "Session failed. End.");
         yield break;
     }



     iteraction = false;

     DebugPanel.Log("Status (Base)", "Session", "Session completed. Waiting the cutscene.");

     yield return new WaitForSeconds(0.2f);
     UIAssistant.main.ShowPage("TargetIsReached");
     AudioAssistant.Shot("TargetIsReached");
     yield return StartCoroutine(Utils.WaitFor(() => CPanel.uiAnimation == 0, 0.4f));


     // show skip button
     UIAssistant.main.ShowPage("Field");
     SkipLevelBtn.gameObject.SetActive (true);

     DebugPanel.Log("Status (Base)", "Session", "Session completed. Bonus matching.");

     // Conversion of the remaining moves into bombs and activating them
     yield return StartCoroutine(BurnLastMovesToPowerups());
     
     yield return StartCoroutine(Utils.WaitFor(CanIWait, 1f));

     DebugPanel.Log("Status (Base)", "Session", "Session completed. Clearing.");

     // Ending the session, showing win popup
     yield return StartCoroutine(GameCamera.main.HideFieldRoutine());
     FieldAssistant.main.RemoveField();

     StartCoroutine (YouWin ());
         //ShowCardPopup();


     DebugPanel.Log("Status (Base)", "Session", "Session completed. End.");
 }

Could anyone help with this simple issue. The button is not showing properly and the engine keeps saying that the button is not assigned even though it is.

Thanks