Opened 7 months ago

Last modified 7 months ago

#598 new defect

Fiona can't be imported into python37, DLL error

Reported by: Andreas Müller Owned by: osgeo4w-dev@…
Priority: major Component: Package
Version: Keywords: python3 fiona geopandas gdal


i falsely posted this on, and i think it should be addressed here:

I installed fiona along with qgis3 and python3 via osgeo4w-setup.exe but it throws an exeption:

    Python 3.7.0 (v3.7.0:1bf9cc5093, Jun 27 2018, 04:06:47) [MSC v.1914 32 bit (Inte
    l)] on win32
    Type "help", "copyright", "credits" or "license" for more information.
    >>> import fiona
    Traceback (most recent call last):
    File "<stdin>", line 1, in <module>
    File "C:\OSGeo4W\apps\Python37\lib\site-packages\fiona\", line 87,
    in <module>
    from fiona.collection import BytesCollection, Collection
    File "C:\OSGeo4W\apps\Python37\lib\site-packages\fiona\", line 9,
    in <module>
    from fiona.ogrext import Iterator, ItemsIterator, KeysIterator
    ImportError: DLL load failed: Das angegebene Modul wurde nicht gefunden.

This is often reported as a version conflict with gdal.

Change History (3)

comment:1 Changed 7 months ago by Andreas Müller

dependency walker tells me, it searches for gdal203.dll, which also could be found as a string inside .pyd files for fiona. So I checked, but it seems we never had this version of gdal in osgeo4w. <= EDIT: I misinterpreted package names, so gdal2.3.x contains gdal203.dll. Also, changing strings inside .pyd files solves the error, may be a workaround...

Last edited 7 months ago by Andreas Müller (previous) (diff)

comment:2 Changed 7 months ago by jef

There is also a transitional package gdal203dll.

comment:3 Changed 7 months ago by Andreas Müller

i tried, but i got the same error, may be that gdal203 has unresolved dependencies. DependencyWalker? tells now that hdf_fw.dll and mfhwf_fw.dll is missing. Hdf_fw.dll was definitely present in former installs though.

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