What to do with such an error - "No MonoBehavior scripts in the file, or their names do not match the file name"?

Question

Unity

Please tell me what to do ..
Here is the code:

using System.Collections;
using UnityEngine;

public class Name : MonoBehaviour
{
    public string Url;
    public GUIText status;
    WebViewObject webViewObject;

    IEnumerator Start()
    {
        webViewObject = (new GameObject("WebViewObject")).AddComponent<WebViewObject>();
        webViewObject.Init(
            cb: (msg) =>
            {
                Debug.Log(string.Format("CallFromJS[{0}]", msg));
                status.text = msg;
                status.GetComponent<Animation>().Play(webViewObject);
            },
            err: (msg) =>
            {
                Debug.Log(string.Format("CallOnError[{0}]", msg));
                status.text = msg;
                status.GetComponent<Animation>().Play(webViewObject);
            },
            started: (msg) =>
            {
                Debug.Log(string.Format("CallOnStarted[{0}]", msg));
            },
            ld: (msg) =>
            {
                Debug.Log(string.Format("CallOnLoaded[{0}]", msg));
#if UNITY_EDITOR_OSX || !UNITY_ANDROID
                // NOTE: depending on the situation, you might prefer
                // the 'iframe' approach.
                // cf. https://github.com/gree/unity-webview/issues/189
#if true
                webViewObject.EvaluateJS(@"
                  if (window && window.webkit && window.webkit.messageHandlers && window.webkit.messageHandlers.unityControl) {
                    window.Unity = {
                      call: function(msg) {
                        window.webkit.messageHandlers.unityControl.postMessage(msg);
                      }
                    }
                  } else {
                    window.Unity = {
                      call: function(msg) {
                        window.location = 'unity:' + msg;
                      }
                    }
                  }
                ");
#else
                webViewObject.EvaluateJS(@"
                  if (window && window.webkit && window.webkit.messageHandlers && window.webkit.messageHandlers.unityControl) {
                    window.Unity = {
                      call: function(msg) {
                        window.webkit.messageHandlers.unityControl.postMessage(msg);
                      }
                    }
                  } else {
                    window.Unity = {
                      call: function(msg) {
                        var iframe = document.createElement('IFRAME');
                        iframe.setAttribute('src', 'unity:' + msg);
                        document.documentElement.appendChild(iframe);
                        iframe.parentNode.removeChild(iframe);
                        iframe = null;
                      }
                    }
                  }
                ");
#endif
#endif
                webViewObject.EvaluateJS(@"Unity.call('ua=' + navigator.userAgent)");
            },
            //ua: "custom user agent string",
            enableWKWebView: true);
#if UNITY_EDITOR_OSX || UNITY_STANDALONE_OSX
        webViewObject.bitmapRefreshCycle = 1;
#endif
        webViewObject.SetMargins(5, 100, 5, Screen.height / 4);
        webViewObject.SetVisibility(true);

#if !UNITY_WEBPLAYER
        if (Url.StartsWith("http")) {
            webViewObject.LoadURL(Url.Replace(" ", "%20"));
        } else {
            var exts = new string[]{
                ".jpg",
                ".js",
                ".html"  // should be last
            };
            foreach (var ext in exts) {
                var url = Url.Replace(".html", ext);
                var src = System.IO.Path.Combine(Application.streamingAssetsPath, url);
                var dst = System.IO.Path.Combine(Application.persistentDataPath, url);
                byte[] result = null;
                if (src.Contains("://")) {  // for Android
                    var www = new WWW(src);
                    yield return www;
                    result = www.bytes;
                } else {
                    result = System.IO.File.ReadAllBytes(src);
                }
                System.IO.File.WriteAllBytes(dst, result);
                if (ext == ".html") {
                    webViewObject.LoadURL("file://" + dst.Replace(" ", "%20"));
                    break;
                }
            }
        }
#else
        if (Url.StartsWith("http")) {
            webViewObject.LoadURL(Url.Replace(" ", "%20"));
        } else {
            webViewObject.LoadURL("StreamingAssets/" + Url.Replace(" ", "%20"));
        }
        webViewObject.EvaluateJS(
            "parent.$(function() {" +
            "   window.Unity = {" +
            "       call:function(msg) {" +
            "           parent.unityWebView.sendMessage('WebViewObject', msg)" +
            "       }" +
            "   };" +
            "});");
#endif
        yield break;
    }

#if !UNITY_WEBPLAYER
    void OnGUI()
    {
        GUI.enabled = webViewObject.CanGoBack();
        if (GUI.Button(new Rect(10, 10, 80, 80), "<")) {
            webViewObject.GoBack();
        }
        GUI.enabled = true;

        GUI.enabled = webViewObject.CanGoForward();
        if (GUI.Button(new Rect(100, 10, 80, 80), ">")) {
            webViewObject.GoForward();
        }
        GUI.enabled = true;

        GUI.TextField(new Rect(200, 10, 300, 80), "" + webViewObject.Progress());
    }
#endif
}

Answer 1

Do the file name and class name match up to a character?

Answer 2

Yes _

Answer 3

Had the same problem. It was fixed for me by the fact that when I opened the project, I opened it with another version of Unity. I decided that it was necessary to open the version in which I constantly worked. As I understand it, there are errors in the versioning of scripts. Hope it helps someone)