[QGIS-Developer] Issue with pyproj import _datadir in 3.4.15 via OWSLib

[Paul Wittle]

Hi,

I'm trying to upgrade our QGIS deployment from 3.4.7 to 3.4.15 and I'm now getting the following error:
from pyproj import _datadir
Traceback (most recent call last):
  File "C:\programs\QGIS_3\apps\Python37\lib\code.py", line 90, in runcode
    exec(code, self.locals)
  File "<input>", line 1, in <module>
  File "C:/programs/QGIS_3/apps/qgis-ltr/./python\qgis\utils.py", line 685, in _import
    mod = _builtin_import(name, globals, locals, fromlist, level)
  File "C:\programs\QGIS_3\apps\Python37\lib\site-packages\pyproj\__init__.py", line 70, in <module>
    from pyproj import _datadir
  File "C:/programs/QGIS_3/apps/qgis-ltr/./python\qgis\utils.py", line 685, in _import
    mod = _builtin_import(name, globals, locals, fromlist, level)
ImportError: DLL load failed: The specified module could not be found.

I accept that this error is being caused by the stack trace of my own plugin but I'm a bit stuck for ideas now. My plugin is importing the WFS libraries from OWSLib and that is then issuing the statement above which then fails.

Has anyone else encountered this issue and if so are there any suggestions on how to fix the issue or alternatively which support group to email about it (I know it might be the OWSLib project)?

So far I've re-installed it multiple times with differing libraries selected in the OWS installer and I've tried https://support.microsoft.com/en-au/help/2977003/the-latest-supported-visual-c-downloads which I found referenced somewhere.

I don't seem to be getting the issue on my 32 bit installation but then for course it was a separate install download so I'm not 100% certain why that one works and this one doesn't.

Any help or pointers would be apricated,

Paul Wittle
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