Unable to active DataPlotly under Mac

[ktrinko]

Describe the bug
Trying to active the Plugin 4.5.1 under MacOS 26.3 with M-Prozessor and QGIS 4.2.1 I get the
following error-messages:

Couldn't load plugin 'DataPlotly' due to an error when calling its classFactory() method
ModuleNotFoundError: No module named 'PyQt6.QtWebEngineWidgets'
Traceback (most recent call last):
  File "/Applications/QGIS-final-4_2_1.app/Contents/Frameworks/lib/python3.12/site-packages/qgis/utils.py", line 496, in _startPlugin
    plugins[packageName] = package.classFactory(iface)
                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/kurt/Library/Application Support/QGIS/QGIS4/profiles/default/python/plugins/DataPlotly/init.py", line 33, in classFactory
    from .data_plotly import DataPlotly
  File "/Applications/QGIS-final-4_2_1.app/Contents/Frameworks/lib/python3.12/site-packages/qgis/utils.py", line 1119, in _import
    mod = _builtin_import(name, globals, locals, fromlist, level)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/kurt/Library/Application Support/QGIS/QGIS4/profiles/default/python/plugins/DataPlotly/data_plotly.py", line 35, in
    from DataPlotly.gui.dock import DataPlotlyDockManager
  File "/Applications/QGIS-final-4_2_1.app/Contents/Frameworks/lib/python3.12/site-packages/qgis/utils.py", line 1119, in _import
    mod = _builtin_import(name, globals, locals, fromlist, level)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/kurt/Library/Application Support/QGIS/QGIS4/profiles/default/python/plugins/DataPlotly/gui/dock.py", line 19, in
    from DataPlotly.gui.plot_settings_widget import DataPlotlyPanelWidget
  File "/Applications/QGIS-final-4_2_1.app/Contents/Frameworks/lib/python3.12/site-packages/qgis/utils.py", line 1119, in _import
    mod = _builtin_import(name, globals, locals, fromlist, level)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/kurt/Library/Application Support/QGIS/QGIS4/profiles/default/python/plugins/DataPlotly/gui/plot_settings_widget.py", line 71, in
    from qgis.PyQt.QtWebEngineWidgets import QWebEngineView
  File "/Applications/QGIS-final-4_2_1.app/Contents/Frameworks/lib/python3.12/site-packages/qgis/utils.py", line 1119, in _import
    mod = _builtin_import(name, globals, locals, fromlist, level)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Applications/QGIS-final-4_2_1.app/Contents/Frameworks/lib/python3.12/site-packages/qgis/PyQt/QtWebEngineWidgets.py", line 20, in
    from PyQt6.QtWebEngineWidgets import *
  File "/Applications/QGIS-final-4_2_1.app/Contents/Frameworks/lib/python3.12/site-packages/qgis/utils.py", line 1119, in _import
    mod = _builtin_import(name, globals, locals, fromlist, level)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ModuleNotFoundError: No module named 'PyQt6.QtWebEngineWidgets'

Python version: 3.12.11 (main, Jul 17 2026, 00:25:09) [Clang 17.0.0 (clang-1700.6.4.2)] 
QGIS version: 4.2.1-Belém do Pará Belém do Pará, f229b86a
Python Path:
• /Users/kurt/Library/Application Support/QGIS/QGIS4/profiles/default/python/plugins/GeoSpreadsheet/_vendor
• /Users/kurt/Library/Application Support/QGIS/QGIS4/profiles/default/python/plugins/cartagen4qgis
• /Applications/QGIS-final-4_2_1.app/Contents/Resources/qgis/python
• /Users/kurt/Library/Application Support/QGIS/QGIS4/profiles/default/python
• /Users/kurt/Library/Application Support/QGIS/QGIS4/profiles/default/python/plugins
• /Applications/QGIS-final-4_2_1.app/Contents/Resources/qgis/python/plugins
• /Applications/QGIS-final-4_2_1.app/Contents/Frameworks/lib/python312.zip
• /Applications/QGIS-final-4_2_1.app/Contents/Frameworks/lib/python3.12
• /Applications/QGIS-final-4_2_1.app/Contents/Frameworks/lib/python3.12/lib-dynload
• /Applications/QGIS-final-4_2_1.app/Contents/Frameworks/lib/python3.12/site-packages
• /Users/kurt/Library/Application Support/QGIS/QGIS4/profiles/default/python
• /Users/kurt/Library/Application Support/QGIS/QGIS4/profiles/default/python/plugins
• /Users/kurt/Library/Application Support/QGIS/QGIS4/profiles/default/python/plugins/HCMGIS/forms
• /Users/kurt/Library/Application Support/QGIS/QGIS4/profiles/default/python/plugins/vector_to_map
• /Users/kurt/Library/Application Support/QGIS/QGIS4/profiles/default/python/plugins/mmqgis/forms
• /Users/kurt/Library/Application Support/QGIS/QGIS4/profiles/default/python/plugins/shapetools/ext-libs
• /Users/kurt/Desktop

[ghtmtt]

you are missing the PyQt6.QtWebEngineWidgets module and you need to install it by yourself. I'm not an OSX expert and I'm not sure that install it via pip is enough. @m-kuhn do you have many some hints?

[m-kuhn]

QtWebEngine is not yet included in the mac releases unfortunately and I doubt that installing it via pip will work. The last time I tried to build QtWebEngine, the github actions runner timed out after 6h, I am currently investigating the options for more powerful runners with the PSC.

[ghtmtt]

thanks @m-kuhn for the super quick reply. I knew that for OSX it is still a little bit complicated. If you have any other news that I'm not aware of, please add here the information!

Thanks again