Problem UCF

Hello.

My environment: jre 8u301, Inetrnet Explorer 11, webtop 6.8.

When invoke ucf in my webtop application an error occurs in java console:

com.documentum.ucf.client.install.launcher.InvocationException: Произошла ошибка при вызове времени выполнения UCF. Подробности:
Failed to connect to server - refer ucf client logs for details
	at com.documentum.ucf.client.install.launcher.impl.RuntimeInvoker.retrieveContent(RuntimeInvoker.java:613)
	at com.documentum.ucf.client.install.launcher.impl.RuntimeInvoker.initConnectionForSharedProcess(RuntimeInvoker.java:421)
	at com.documentum.ucf.client.install.launcher.impl.RuntimeInvoker.initConnection(RuntimeInvoker.java:74)
	at com.documentum.web.applet.ucfinvoker.LaunchRuntimeDelegate.connectRuntime(Unknown Source)
	at com.documentum.web.applet.ucfinvoker.Java2DelegateImpl.access$201(Unknown Source)
	at com.documentum.web.applet.ucfinvoker.Java2DelegateImpl$3.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at com.documentum.web.applet.ucfinvoker.Java2DelegateImpl.connectRuntime(Unknown Source)
....
network: Connecting http://localhost:8080/webtop/wdk5-appletresultsink;jsessionid=4EC4A7F2C2864EE374591037BF79BA60 with cookie "d6_wdk_pref0=eJw9TskKwjAU/BahR6nGpNaK76Z48lLwXB7J6wJpErLg75sI9jLMAjNTsQZG1IFuu0oI6O9Oqif7ZMXaLTgyiBQiLy6HjKcOrkxcun2Y1eBj8RlsXHBQVqaVTExr1o2AR/LW0eFlg7S/8vO/HJ3Ti8S4WFNrNFPCiWpFIyYdB20lagKfhv5dfrR5/AtcKzds; JSESSIONID=4EC4A7F2C2864EE374591037BF79BA60; appname=webtop; wdk_sess_cookie_0=eJxTMTGz1S/OSIkvKtEvSS0uMbZRVDEwtIUxTcxtTVydTRzN3YycjSzMTFxdjc1NTC0NDYzNndzMLZ0czQxAqixsk3MSi4szk0EcS9uM/NzU5MSkzLzUkni4BAARjx5p; lockFresh=free; allFreshClient=%%cookieTS__client521256729##1629954500719%%__dmfFreshClient__client521256729##stale%%__dmfFreshForm__client521256729##1629954500718%%cookieTS__client1489498168##1629954516544%%__dmfFreshClient__client1489498168##stale%%__dmfFreshForm__client1489498168##1629954516543%%cookieTS__client-1618054554##1629954558739%%__dmfFreshClient__client-1618054554##stale%%__dmfFreshForm__client-1618054554##1629954558738; timeoutHandler84A80D82286231096DA17DA7D80AEB57=1629954501688; __dmfClientId=1629954497774; timeoutHandler4EC4A7F2C2864EE374591037BF79BA60=1629954558995"
failed sending error: IOException 
java.io.IOException: Server returned HTTP response code: 401 for URL: http://localhost:8080/webtop/wdk5-appletresultsink;jsessionid=4EC4A7F2C2864EE374591037BF79BA60
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source)
	at sun.net.www.protocol.http.HttpURLConnection.access$200(Unknown Source)
	at sun.net.www.protocol.http.HttpURLConnection$9.run(Unknown Source)
	at sun.net.www.protocol.http.HttpURLConnection$9.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.AccessController.doPrivilegedWithCombiner(Unknown Source)
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
	at com.documentum.web.applet.util.SendToResultSink.sendDataToSink(Unknown Source)
	at com.documentum.web.applet.ucfinvoker.LaunchRuntimeDelegate.checkAndNotifyError(Unknown Source)
	at com.documentum.web.applet.ucfinvoker.LaunchRuntimeDelegate.getUcfSessionId(Unknown Source)
	at com.documentum.web.applet.ucfinvoker.ResidentLaunchRuntime.getUcfSessionId(Unknown Source)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at sun.plugin.javascript.Trampoline.invoke(Unknown Source)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at sun.plugin.javascript.JSClassLoader.invoke(Unknown Source)
	at sun.plugin2.liveconnect.JavaClass$MethodInfo.invoke(Unknown Source)
	at sun.plugin2.liveconnect.JavaClass$MemberBundle.invoke(Unknown Source)
	at sun.plugin2.liveconnect.JavaClass.invoke0(Unknown Source)
	at sun.plugin2.liveconnect.JavaClass.invoke(Unknown Source)
	at sun.plugin2.main.client.LiveConnectSupport$PerAppletInfo$DefaultInvocationDelegate.invoke(Unknown Source)
	at sun.plugin2.main.client.LiveConnectSupport$PerAppletInfo$3.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at sun.plugin2.main.client.LiveConnectSupport$PerAppletInfo.doObjectOp(Unknown Source)
	at sun.plugin2.main.client.LiveConnectSupport$PerAppletInfo$LiveConnectWorker.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)

and then this:

SUCCESSFULLY LOADED validation.properties via the CLASSPATH from '/ (root)' using current thread context class loader!
08:12:44,764 ERROR [http-bio-8080-exec-10] com.documentum.web.common.Trace -
com.documentum.web.contentxfer.ucf.UcfSessionManager$ClientException
    at com.documentum.web.contentxfer.ucf.UcfSessionManager.newSession(UcfSessionManager.java:432)
    at com.documentum.web.contentxfer.ucf.UcfSessionManager.getSession(UcfSessionManager.java:137)
    at com.documentum.web.contentxfer.ucf.UcfContentTransport.getUcfSession(UcfContentTransport.java:195)
    at com.documentum.web.contentxfer.ucf.UcfContentTransport.<init>(UcfContentTransport.java:68)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
    at java.lang.Class.newInstance(Class.java:442)
    at com.documentum.webcomponent.library.contenttransfer.ContentTransferServiceContainer.createTransport(ContentTransferServiceContainer.java:731)
    at com.documentum.webcomponent.library.contenttransfer.ContentTransferServiceContainer.invokeService(ContentTransferServiceContainer.java:320)
    at com.documentum.webcomponent.library.contenttransfer.importcontent.ImportContentContainer.invokeService(ImportContentContainer.java:1135)

How to resolve this problem?