Java.Lang.Exception error

When I try to open webview I receive an error log below. How can I solve this?

** Activity (main) Create, isFirst = true **
** Activity (main) Resume **
** Activity (main) Resume **
** Activity (main) Pause, UserClosed = false **
** Activity (main) Resume **
true
An error occurred:
(Line: 0) null
java.lang.Exception: Sub webviewmap_pagefinished signature does not match expected signature.
public static anywheresoftware.b4a.pc.RemoteObject...

Java.Lang.Exception error

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