qt.qpa.xcb: xcb_shm_create_segment() failed for size 1228800

The warning occurs each time my GUI app is executed. The program  proceeds OK  Ran with QT_DEBUG_PLUGINS=1.

Here's a snippet from the application output possibly indicating a missing plugin - accessible.

Got keys from plugin meta data ("vnc")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/plugins/platforms/

I suspect a missing plugin. See segment below:

Got keys from plugin meta data ("xcb_egl")
QFactoryLoader::QFactoryLoader() checking directory path "/opt/panel/bin/xcbglintegrations" ...
loaded library "/usr/lib/plugins/xcbglintegrations/libqxcb-egl-integration.so"

QFactoryLoader::QFactoryLoader() checking directory path "/usr/lib/plugins/accessible" ...
QFactoryLoader::QFactoryLoader() checking directory path "/opt/panel/bin/accessible" ...
qt.qpa.xcb: xcb_shm_create_segment() failed for size 1228800

The whole app. output  is attached in attachment below.