Selector doesn't find element in webview

[kkabanova]

Hi everyone! I try to click button in webview, but I get error:

`The following PatrolActionException was thrown running a test:
Patrol action failed: NativeAutomatorClientException:
waitUntilVisible() failed with Invalid response: 404 selector
UiSelector[CONTAINS_TEXT=Register] found nothing

When the exception was thrown, this was the stack:
#0 NativeAutomator._wrapRequest (package:patrol/src/native/native_automator.dart:252:7)

#1 NativeAutomator.waitUntilVisible (package:patrol/src/native/native_automator.dart:822:5)

#2 main. (file:///Users/xxxxx/StudioProjects/umc-template-new-jersey/integration_test/example_test.dart:36:7)

#3 patrolTest. (package:patrol/src/common.dart:149:7)

#4 testWidgets.. (package:flutter_test/src/widget_tester.dart:193:15)

#5 TestWidgetsFlutterBinding._runTestBody (package:flutter_test/src/binding.dart:1064:5)

#6 TestWidgetsFlutterBinding._createTestCompletionHandler. (package:flutter_test/src/binding.dart:814:12)

`

I wrote this code:
await $.native.waitUntilVisible(Selector(textContains: 'Register'));

How can I find my element in webview? Or how can gebug which elements are visible? Also I tried to use getNativeViews(), but It returns 500 error.