QObject::moveToThread Cannot move to target thread.

[nicolinux72]

Hi,

I got this error when try to launch PPOCRLabel:

$ PPOCRLabel
QObject::moveToThread: Current thread (0x213f630) is not the object's thread (0x51f3a50).
Cannot move to target thread (0x213f630)

qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "/home/nicola/miniconda3/envs/head-less/lib/python3.11/site-packages/cv2/qt/plugins" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: xcb, eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx, webgl.

Any idea?

Thank you.

[wh1t3h47]

Hi,
I have no idea if this will work for you
Either try this:

apt install '^libxcb.*-dev' libx11-xcb-dev libglu1-mesa-dev libxrender-dev libxi-dev libxkbcommon-dev libxkbcommon-x11-dev

Or:

export QT_QPA_PLATFORM=offscreen

Let me know if worked

[wh1t3h47]

You can set QT_QPA_PLATFORM to any of the provided values (in the error message)

Available platform plugins are: xcb, eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx, webgl.

I.e.:

export QT_QPA_PLATFORM=xcb
# or
export QT_QPA_PLATFORM=eglfs
# or
export QT_QPA_PLATFORM=linuxfb
# or
export QT_QPA_PLATFORM=minimal
# or
export QT_QPA_PLATFORM=minimalegl
# or
export QT_QPA_PLATFORM=offscreen
# or
export QT_QPA_PLATFORM=vnc # I think this one will work only if you have vnc server/ client
# or
export QT_QPA_PLATFORM=wayland-egl
# or
export QT_QPA_PLATFORM=wayland
# or
export QT_QPA_PLATFORM=wayland-xcomposite-egl
# or
export QT_QPA_PLATFORM=wayland-xcomposite-glx
# or
export QT_QPA_PLATFORM=webgl