#1617 TidhtVNC server gray screen

[Bee Air]

Good afternoon!
I installed on Debian 12, KDE, TidhtVNC server 1.3.10. I'm trying to connect to a Debian 12 desktop with Windows 10 TidhtVNC Viewer 2.8.8. The password is accepted, but a gray screen appears.

The log has the following entry:

27/07/23 20:53:21 Xvnc version TightVNC-1.3.10
27/07/23 20:53:21 Copyright (C) 2000-2009 TightVNC Group
27/07/23 20:53:21 Copyright (C) 1999 AT&T Laboratories Cambridge
27/07/23 20:53:21 All Rights Reserved.
27/07/23 20:53:21 See http://www.tightvnc.com/ for information on TightVNC
27/07/23 20:53:21 Desktop name 'X' (debian12:1)
27/07/23 20:53:21 Protocol versions supported: 3.3, 3.7, 3.8, 3.7t, 3.8t
27/07/23 20:53:21 Listening for VNC connections on TCP port 5901
QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root'
qt.qpa.xcb: XKeyboard extension not present on the X server
QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root'
qt.qpa.xcb: XKeyboard extension not present on the X server
QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root'
QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root'
QObject: Cannot create children for a parent that is in a different thread.
(Parent is SplashApp(0x7fff1060d720), parent's thread is QThread(0x55c2066f9880), current thread is QThread(0x55c2067e29c0)
QObject::installEventFilter(): Cannot filter events for objects in a different thread.
qt.qpa.xcb: QXcbConnection: XCB error: 2 (BadValue), sequence: 372, resource id: 32, major code: 53 (CreatePixmap), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 373, resource id: 8388627, major code: 55 (CreateGC), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 374, resource id: 8388627, major code: 55 (CreateGC), minor code: 0

27/07/23 20:53:36 Got connection from client 200.2.3.45
27/07/23 20:53:36 Using protocol version 3.8
27/07/23 20:53:36 Enabling TightVNC protocol extensions
27/07/23 20:53:42 Full-control authentication passed by 200.2.3.45
27/07/23 20:53:42 Using tight encoding for client 200.2.3.45
27/07/23 20:53:42 rfbProcessClientNormalMessage: ignoring unknown encoding 16
27/07/23 20:53:42 Using image quality level 6 for client 200.2.3.45
27/07/23 20:53:42 rfbProcessClientNormalMessage: ignoring unknown encoding -223
27/07/23 20:53:42 Enabling LastRect protocol extension for client 200.2.3.45
27/07/23 20:53:42 Enabling cursor position updates for client 200.2.3.45
27/07/23 20:53:42 Enabling full-color cursor updates for client 200.2.3.45
27/07/23 20:54:04 Client 200.2.3.45 gone
27/07/23 20:54:04 Statistics:
27/07/23 20:54:04   key events received 1, pointer events 212
27/07/23 20:54:04   framebuffer updates 1940, rectangles 3894, bytes 57030
27/07/23 20:54:04     LastRect markers 1940, bytes 23280
27/07/23 20:54:04     cursor shape updates 2, bytes 1752
27/07/23 20:54:04     cursor position updates 1, bytes 12
27/07/23 20:54:04     tight rectangles 1951, bytes 31986
27/07/23 20:54:04   raw bytes equivalent 1807768304, compression ratio 56517.485900

Please help! I can't find the right solution for the problem!

TidhtVNC server settings:
/root/.vnc/config

rfbport=5900
 useipv4
 geometry=1366x768
 depth=24
 alwaysshared
 securitytypes=None

/root/.vnc/xstartup

 #!/bin/sh

 unset SESSION_MANAGER
 unset DBUS_SESSION_BUS_ADDRESS
 exec startplasma-x11