Oops. Dumb mistake changing title to "Mojave" when I thought I was searching for "Mojave".

I changed the title back to what it was

I see. My fault. Sorry. I assumed that all required Qt5 libraries were
installed. In fact, neither QtWebKitWidgets nor QWebEngineWidgets for Qt 5.9
were installed in my system. I should had checked that before posting.

Just for notice: I have discovered that MacPorts builds PyQt 5.9 without
supporting WebEngine and WebKit unless those variants were called on installing.

After reinstalling py36-pyqt5 package (with +webengine and +webkit variants), I
have been able to run eric6 17.11.

Thanks.

You seemed to be missing QtWebEngineWidgets and/or QtWebKitWidgets. The next 
version of eric will make the HTML based code documentation viewer optional.

After updating from 17.10 to 17.11, eric6 cannot be run and the following error
message has been issued (I finally downgraded to 17.10):

--------------------------------------------------------------------------------
2017-11-06, 13:37:07
--------------------------------------------------------------------------------
<class 'ModuleNotFoundError'>: 
No module named 'PyQt5.QtWebKitWidgets'
--------------------------------------------------------------------------------
  File
"/opt/local/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/eric6/eric6.py",
line 379, in <module>
    main()
  File
"/opt/local/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/eric6/eric6.py",
line 360, in main
    disablecrash, restartArgs)
  File
"/opt/local/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/eric6/UI/UserInterface.py",
line 254, in __init__
    self.__createLayout(debugServer)
  File
"/opt/local/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/eric6/UI/UserInterface.py",
line 694, in __createLayout
    self.__createSidebarsLayout(debugServer)
  File
"/opt/local/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/eric6/UI/UserInterface.py",
line 907, in __createSidebarsLayout
    self.codeDocumentationViewer = CodeDocumentationViewer(self)
  File
"/opt/local/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/eric6/UI/CodeDocumentationViewer.py",
line 200, in __init__
    self.__setupUi()
  File
"/opt/local/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/eric6/UI/CodeDocumentationViewer.py",
line 289, in __setupUi
    self.__richTextViewer = WebViewDocumentationViewer(self)
  File
"/opt/local/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/eric6/UI/CodeDocumentationViewer.py",
line 126, in __init__
    from PyQt5.QtWebKitWidgets import QWebPage, QWebView

--------------------------------------------------------------------------------
Version Numbers:
  Python 3.6.3
  Qt 5.9.2
  PyQt 5.9
  sip 4.19.4
  QScintilla 2.10.1
  eric6 17.11 (rev. 02c25eed0ff2)

Platform: darwin
3.6.3 (default, Oct  7 2017, 10:00:26) 
[GCC 4.2.1 Compatible Apple LLVM 9.0.0 (clang-900.0.37)]

---------------------------------------------------------------------------------------------------------------------------


Additionally,

- My machine runs MacOs Sierra 10.12.6
- Python, Qt, PyQt, sip, and QScintilla have been installed from macports
(version 2.4.2)



Once I have downgraded to 17.10, eric6 runs smoothly again.

I have updated and downgraded several times and I get always the same result.

Thanks a lot