Data Plotly does not run in 4.0.1 on a PC

[grantboxer]

Describe the bug
I get the following error log when trying to open Data Plotly in ver 4.
2026-04-11T13:04:32 CRITICAL Traceback (most recent call last):
File "C:\Users/boxer/AppData/Local/Programs/OSGeo4W/apps/qgis/./python\qgis\utils.py", line 475, in startPlugin
plugins[packageName] = package.classFactory(iface)
^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users/boxer/AppData/Roaming/QGIS/QGIS4\profiles\Grant2025/python/plugins\DataPlotly_init.py", line 33, in classFactory
from .data_plotly import DataPlotly
File "C:\Users/boxer/AppData/Local/Programs/OSGeo4W/apps/qgis/./python\qgis\utils.py", line 1082, in _import
mod = _builtin_import(name, globals, locals, fromlist, level)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users/boxer/AppData/Roaming/QGIS/QGIS4\profiles\Grant2025/python/plugins\DataPlotly\data_plotly.py", line 35, in
from DataPlotly.gui.dock import DataPlotlyDockManager
File "C:\Users/boxer/AppData/Local/Programs/OSGeo4W/apps/qgis/./python\qgis\utils.py", line 1082, in _import
mod = _builtin_import(name, globals, locals, fromlist, level)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users/boxer/AppData/Roaming/QGIS/QGIS4\profiles\Grant2025/python/plugins\DataPlotly\gui\dock.py", line 19, in
from DataPlotly.gui.plot_settings_widget import DataPlotlyPanelWidget
File "C:\Users/boxer/AppData/Local/Programs/OSGeo4W/apps/qgis/./python\qgis\utils.py", line 1082, in _import
mod = _builtin_import(name, globals, locals, fromlist, level)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users/boxer/AppData/Roaming/QGIS/QGIS4\profiles\Grant2025/python/plugins\DataPlotly\gui\plot_settings_widget.py", line 71, in
from qgis.PyQt.QtWebEngineWidgets import QWebEngineView
File "C:\Users/boxer/AppData/Local/Programs/OSGeo4W/apps/qgis/./python\qgis\utils.py", line 1082, in _import
mod = _builtin_import(name, globals, locals, fromlist, level)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users/boxer/AppData/Local/Programs/OSGeo4W/apps/qgis/./python\qgis\PyQt\QtWebEngineWidgets.py", line 20, in
from PyQt6.QtWebEngineWidgets import *
File "C:\Users/boxer/AppData/Local/Programs/OSGeo4W/apps/qgis/./python\qgis\utils.py", line 1082, in _import
mod = _builtin_import(name, globals, locals, fromlist, level)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ModuleNotFoundError: No module named 'PyQt6.QtWebEngineWidgets'

[ghtmtt]

not sure if or how Windows is handling QtWebEngine, that is the replacement of QtWebKit. But this missing dependency is the reason of the error. Maybe you can try to reinstall QGIS?

[sjib]

This might help: <qgis/QGIS#59027> qgis/QGIS#59027

[Djedouas]

Could you try installing QGIS with OSGeo4W installer?

It works for me on QGIS 4.0.1 installed with this method, which seemd to embark the needed dependency (i.e. QtWebEngine).

[grantboxer]

I use the network installer and works OK for me in v4.

[pigreco]

Report Details

Python Stack Trace

Windows fatal exception: code 0x80000003

Current thread 0x00001318 (most recent call first):
  File "C:\Users/pigre/AppData/Roaming/QGIS/QGIS4\profiles\default/python/plugins\DataPlotly\gui\plot_settings_widget.py", line 642 in helpPage
    self.help_view.load(QUrl(''))
  File "C:\Users/pigre/AppData/Roaming/QGIS/QGIS4\profiles\default/python/plugins\DataPlotly\gui\plot_settings_widget.py", line 251 in __init__
    self.helpPage()
  File "C:\Users/pigre/AppData/Roaming/QGIS/QGIS4\profiles\default/python/plugins\DataPlotly\gui\dock.py", line 38 in __init__
    self.main_panel = DataPlotlyPanelWidget(
  File "C:\Users/pigre/AppData/Roaming/QGIS/QGIS4\profiles\default/python/plugins\DataPlotly\gui\dock.py", line 96 in addNewDock
    dock = DataPlotlyDock(
  File "C:\Users/pigre/AppData/Roaming/QGIS/QGIS4\profiles\default/python/plugins\DataPlotly\data_plotly.py", line 133 in initGui
    self.dock_widget = self.dock_manager.addNewDock()
  File "C:\OSGeo4W/apps/qgis/./python\qgis\utils.py", line 511 in startPlugin
    plugins[packageName].initGui()
  File "C:\OSGeo4W/apps/qgis/./python\pyplugin_installer\installer.py", line 340 in showPluginManagerWhenReady
    iface.pluginManagerInterface().showPluginManager(tabIndex)

Stack Trace

TargetNtUnmapViewOfSection :
TargetNtUnmapViewOfSection :
TargetNtUnmapViewOfSection :
TargetNtUnmapViewOfSection :
QtWebEngineCore::ProfileAdapterClient::downloadInterruptReasonToString :
QtWebEngineCore::ProfileAdapterClient::downloadInterruptReasonToString :
QtWebEngineCore::ProfileAdapter::ProfileAdapter :
QtWebEngineCore::WebContentsAdapter::wasShown :
QWebEngineProfile::defaultProfile :
QWebEnginePagePrivate::QWebEnginePagePrivate :
QWebEnginePage::QWebEnginePage :
QWebEngineView::load :
PyInit_QtWebEngineWidgets :
PyThread_acquire_lock_timed :
PyObject_Vectorcall :
PyObject_Vectorcall :
PyEval_EvalFrameDefault :
PyFunction_Vectorcall :
PyNumber_Long :
PyObject_Vectorcall :
PyObject_Vectorcall :
PyEval_EvalFrameDefault :
PyFunction_Vectorcall :
PyNumber_Long :
PyObject_Vectorcall :
PyObject_Vectorcall :
PyEval_EvalFrameDefault :
PyType_CalculateMetaclass :
PyEval_EvalCode :
PyEval_EvalCode :
PyModule_ClearDict :
PyRun_StringFlags :
instance :
instance :
QgsPluginRegistry::loadPythonPlugin :
QgsSensorTableWidget::tr :
QgsSensorTableWidget::tr :
QgisApp::identifyMapTool :
QObject::qt_static_metacall :
QMetaObject::activate :
QStandardItemModel::qt_static_metacall :
QObject::qt_static_metacall :
QMetaObject::activate :
QAbstractItemModel::dataChanged :
QStandardItemModel::itemChanged :
QStandardItem::setData :
QStandardItemModel::setData :
QSortFilterProxyModel::setData :
QStyledItemDelegate::editorEvent :
QAbstractItemView::selectionModel :
QAbstractItemView::edit :
QAbstractItemView::mouseReleaseEvent :
QListView::mouseReleaseEvent :
QWidget::event :
QFrame::event :
QAbstractItemView::viewportEvent :
QCoreApplicationPrivate::sendThroughObjectEventFilters :
QApplicationPrivate::notify_helper :
QApplication::notify :
QgsApplication::notify :
QCoreApplication::notifyInternal2 :
QApplicationPrivate::sendMouseEvent :
QWidgetRepaintManager::updateStaticContentsSize :
QWidgetRepaintManager::updateStaticContentsSize :
QApplicationPrivate::notify_helper :
QApplication::notify :
QgsApplication::notify :
QCoreApplication::notifyInternal2 :
QGuiApplicationPrivate::processMouseEvent :
QWindowSystemInterface::sendWindowSystemEvents :
QEventDispatcherWin32::processEvents :
QWindowsGuiEventDispatcher::processEvents :
QEventLoop::exec :
QDialog::exec :
QgsPresetSchemeColorRamp::clone :
PyThread_acquire_lock_timed :
PyObject_Vectorcall :
PyObject_Vectorcall :
PyEval_EvalFrameDefault :
PyType_CalculateMetaclass :
PyEval_EvalCode :
PyEval_EvalCode :
PyModule_ClearDict :
PyRun_StringFlags :
instance :
instance :
pdal::Stage::run :
QgsPythonRunner::run :
QgisApp::showPluginManager :
QgisApp::identifyMapTool :
QObject::qt_static_metacall :
QMetaObject::activate :
QAction::activate :
QMenu::actionGeometry :
QMenu::actionGeometry :
QMenu::mouseReleaseEvent :
QWidget::event :
QMenu::event :
QApplicationPrivate::notify_helper :
QApplication::notify :
QgsApplication::notify :
QCoreApplication::notifyInternal2 :
QApplicationPrivate::sendMouseEvent :
QWidgetRepaintManager::updateStaticContentsSize :
QWidgetRepaintManager::updateStaticContentsSize :
QApplicationPrivate::notify_helper :
QApplication::notify :
QgsApplication::notify :
QCoreApplication::notifyInternal2 :
QGuiApplicationPrivate::processMouseEvent :
QWindowSystemInterface::sendWindowSystemEvents :
QEventDispatcherWin32::processEvents :
QWindowsGuiEventDispatcher::processEvents :
QEventLoop::exec :
QCoreApplication::exec :
main :
BaseThreadInitThunk :
RtlUserThreadStart :

QGIS Info
QGIS Version: 4.0.1-Norrköping
QGIS code revision: 1ccf690c2e0
Compiled against Qt: 6.11.0
Running against Qt: 6.11.0
Compiled against GDAL: 3.12.3
Running against GDAL: 3.12.3

System Info
CPU Type: x86_64
Kernel Type: winnt
Kernel Version: 10.0.22631

[ghtmtt]

@pigreco could you be more specific please? When does this error happen?

[pigreco]

@pigreco could you be more specific please? When does this error happen?

The problem occurs when I install it and then deactivate QGIS, as soon as I reactivate it the message appears again:

[pigreco]

@ghtmtt
Tested in a clean profile, as soon as I install it the error appears

QGIS version	4.0.1-Norrköping
QGIS code revision	1ccf690c2e0
Libraries
Qt version	6.11.0
Python version	3.12.13
GDAL version	3.12.3 — Chicoutimi
PROJ version	9.8.1
EPSG Registry database version	v12.029 (2025-10-02)
GEOS version	3.14.1-CAPI-1.20.5
SFCGAL version	2.2.0
GeographicLib version	2.7.0
SQLite version	3.53.0
PDAL version	2.10.0
PostgreSQL client version	17.3
SpatiaLite version	5.1.0
QWT version	6.3.0
QScintilla2 version	2.14.1
OS version	Windows 11 Version 23H2
Active Python plugins
MetaSearch	0.3.6
db_manager	0.1.20
grassprovider	2.12.99
processing	2.12.99
quick_map_services	1.1.0

[ghtmtt]

I tried on a VM but I cannot reproduce the problem, the plugin is working fine. Do you have a chance to test the plugin with QGIS master? It seems a Windows related problem, but the stack trace is not so explanatory

[pigreco]

I tried on a VM but I cannot reproduce the problem, the plugin is working fine. Do you have a chance to test the plugin with QGIS master? It seems a Windows related problem, but the stack trace is not so explanatory

It works in the master!

QGIS version	4.1.0-Master
QGIS code revision	2534b70fdaf
Libraries
Qt version	6.11.0
Python version	3.12.13
GDAL version	3.13.0beta1
PROJ version	9.8.1
EPSG Registry database version	v12.029 (2025-10-02)
GEOS version	3.14.1-CAPI-1.20.5
SFCGAL version	2.2.0
GeographicLib version	2.7.0
SQLite version	3.53.0
PDAL version	2.10.0
PostgreSQL client version	17.3
SpatiaLite version	5.1.0
QWT version	6.3.0
QScintilla2 version	2.14.1
OS version	Windows 11 Version 23H2
This copy of QGIS writes debugging output.
Active Python plugins
DataPlotly	4.5.0
MetaSearch	0.3.6
db_manager	0.1.20
grassprovider	2.12.99
processing	2.12.99
quick_map_services	1.1.0