Failed to decompress data for the AssetBundle

Hello!

Almost All my bundles loads fine, but with some of my bundles I get this error:
Error while downloading Asset Bundle: Failed to decompress data for the AssetBundle

And problem is only for WebGL build. For OSX all is ok with loading bundles.

This is my code I use to load bundle.

public IEnumerator LoadAsset(string bundleName, string assetName, Action<GameObject> callback)
    {

        bool flag_assetIsLoaded = false;

        Stopwatch st = Stopwatch.StartNew();

        AssetBundle bundle = null;
        string s = "";


        bundle = CheckBundleLoaded(bundleName);
        flag_sceneIsLoaded = bundle != null;

        s += "Сheck bundle time:" + st.ElapsedMilliseconds + "  ";

        string assetBundleName = bundleName;
      
        string url = Application.dataPath;
        if(url[url.Length - 1] != '/') url = string.Concat(url,"/");

        url = URLReturn(url,assetBundleName);

        if(!flag_assetIsLoaded)
        {
            st = Stopwatch.StartNew();

            var uwr = UnityWebRequestAssetBundle.GetAssetBundle(url);

            UnityWebRequestAsyncOperation uwrao = uwr.SendWebRequest();

            while(!uwrao.isDone)
            {
                progress = uwrao.progress;
                yield return null;
            }

            s += "Request time:" +  st.ElapsedMilliseconds + "  ";

            st = Stopwatch.StartNew();

            bundle = DownloadHandlerAssetBundle.GetContent(uwr);


            s += "Content time:" +  st.ElapsedMilliseconds + "  ";

            flag_assetIsLoaded = true;

        }

        st = Stopwatch.StartNew();

        AssetBundleRequest abr = bundle.LoadAssetAsync(assetName);

        while(!abr.isDone)
        {
            progress = abr.progress;
            yield return null;
        }  

        callback(abr.asset as GameObject);

        s += "LoadAsset time:" +  st.ElapsedMilliseconds + "  ";
        #if DEBUG_LOG
        UnityEngine.Debug.Log("Bundle:" + bundleName + "Asset" + " " + abr.asset.name + " " + s );
        #endif

        bundle.Unload(false);
    }

What’s can be wrong?
Unity 2018.2

Are your asset bundles up-to-date with the version of Unity you are using?