to use main thread

GMERemittance/AppDelegate.swift

@@ -270,20 +270,22 @@ extension AppDelegate: BiometricAuthenticationViewControllerDelegate{
     func viewController(_ viewController: BiometricAuthenticationViewController, didFailWithError error: Error, errorMessage: String?) {
         print("BiometricAuthenticationWireframe Error: \(errorMessage ?? "")")
         
-        if let error = error as? BiometricAuthenticationError {
-            
-            switch error {
-            case .biometryNotAvailable, .userFallback:
-                let secureKeypad = SecureKeypad(target: viewController)
-                
-                secureKeypad.title = "Password of your account"
-                secureKeypad.placeholder = "Enter your password for login"
-                secureKeypad.placeholderFont = UIFont(name: "Arial", size: 15)
+        DispatchQueue.main.async {
+            if let error = error as? BiometricAuthenticationError {
                 
-                secureKeypad.delegate = self
-                secureKeypad.present(animated: true)
-            default:
-                break
+                switch error {
+                case .biometryNotAvailable, .userFallback:
+                    let secureKeypad = SecureKeypad(target: viewController)
+                    
+                    secureKeypad.title = "Password of your account"
+                    secureKeypad.placeholder = "Enter your password for login"
+                    secureKeypad.placeholderFont = UIFont(name: "Arial", size: 15)
+                    
+                    secureKeypad.delegate = self
+                    secureKeypad.present(animated: true)
+                default:
+                    break
+                }
             }
         }
     }