Fiona: ImportError DLL load failed: The specified module could not be found

[mattijn]

Im on windows 64bit,
Have installed python 3.5 and cannot load the Fiona module (Fiona source is from Golke: Fiona‑1.7.1‑cp35‑cp35m‑win_amd64.whl)
GDAL is also from Golke, first I had GDAL‑2.0.3‑cp35‑cp35m‑win_amd64.whl, but after an update to GDAL‑2.1.2‑cp35‑cp35m‑win_amd64.whl it fails to load as well.

from fiona.ogrext import Iterator, ItemsIterator, KeysIterator

---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
<ipython-input-2-5228042b14eb> in <module>()
----> 1 from fiona.ogrext import Iterator, ItemsIterator, KeysIterator

c:\python35\lib\site-packages\fiona\__init__.py in <module>()
     74 except ImportError:
     75     pass
---> 76 from fiona.collection import Collection, BytesCollection, vsi_path
     77 from fiona._drivers import driver_count, GDALEnv
     78 from fiona.drvsupport import supported_drivers

c:\python35\lib\site-packages\fiona\collection.py in <module>()
      6 
      7 from fiona import compat
----> 8 from fiona.ogrext import Iterator, ItemsIterator, KeysIterator
      9 from fiona.ogrext import Session, WritingSession
     10 from fiona.ogrext import (

ImportError: DLL load failed: The specified module could not be found.

p.s I've another win 64-bit system running Fiona 1.7.0 with GDAL just fine
add. Hm, using the Fiona 1.7.0 wheel it als fails on my windows system (windows server 2012)

[rbuffat]

Have you tried uninstalling fiona, gdal and eventually rasterio and installing the latest version again? I got this kind of error message when I upgraded gdal without recompiling fiona.

[mattijn]

I forced to install newest gdal from Gohlke (pip install gdal.xx.xx.whl --upgrade) and also the whl from fiona (pip install fiona.xx.xx.whl --upgrade) and after that I could import all modules. Issue can be closed

EDIT August 2019
I ran into this issue again and eventually found out that GDAL version 3 is not yet supported by Fiona. So installing GDAL 2.4.1 from Gohlke resolved my issue.
Note: Apparently I did already knew this since I'd answered this as well on SO last June..

[sgillies]

Thanks for following up @mattijn!

[atlefren]

i seem to run into this issue as well

Using:

GDAL-2.1.2-cp27-cp27m-win32.whl and
Fiona-1.7.1-cp27-cp27m-win32.whl

on a win 8 machine (with python 2.7), running from git bash.

Uninstalling, wiping the venv or running the upgrade as @mattijn suggested does not wor either

Traceback (most recent call last):
  File "importer.py", line 4, in <module>
    import fiona
  File "D:\code\dvh2-prototype\venv\lib\site-packages\fiona\__init__.py", line 76, in <module>
    from fiona.collection import Collection, BytesCollection, vsi_path
  File "D:\code\dvh2-prototype\venv\lib\site-packages\fiona\collection.py", line 8, in <module>
    from fiona.ogrext import Iterator, ItemsIterator, KeysIterator
ImportError: DLL load failed: The specified module could not be found.

[atlefren]

i tried re-installing python (this time 64 bit) and installing the 64-bit versions, same error. Also tried
Fiona-1.7.1-cp27-cp27m-win_amd64.whl, still no luck

[rbuffat]

Have you installed the Microsoft Visual C++ 2008 redistributable packages?

Many binaries depend on numpy-1.11+mkl and the Microsoft Visual C++ 2008 (x64, x86, and SP1 for CPython 2.6 and 2.7), Visual C++ 2010 (x64, x86, for CPython 3.3 and 3.4), or the Visual C++ 2015 (x64 and x86 for CPython 3.5 and 3.6) redistributable packages.

From http://www.lfd.uci.edu/~gohlke/pythonlibs/

[geographika]

I had a similar error, that could be recreated with the following script on Windows 10 x64, Python27:

md C:\VirtualEnvs\test
cd C:\VirtualEnvs
C:\Python27\Scripts\virtualenv test
C:\VirtualEnvs\test\Scripts\activate
python -m pip install pip -U
pip install D:\Installation\Python\GDAL-2.2.4-cp27-cp27m-win_amd64.whl
pip install D:\Installation\Python\Fiona-1.7.13-cp27-cp27m-win_amd64.whl
python -c "import fiona"

Caused:

(test) C:\VirtualEnvs>python -c "import fiona"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "C:\VirtualEnvs\test\lib\site-packages\fiona\__init__.py", line 77, in <module>
    from fiona.collection import Collection, BytesCollection, vsi_path
  File "C:\VirtualEnvs\test\lib\site-packages\fiona\collection.py", line 9, in <module>
    from fiona.ogrext import Iterator, ItemsIterator, KeysIterator
ImportError: DLL load failed: The specified module could not be found.

As hinted at above The solution for was to install numpy:
pip install numpy

Then all imports etc. were fine. Is numpy a required dependencyfor fiona?

[kurt-rhee]

I have the same issue on Windows 10 in an Anaconda environment. I have tried to update both with conda update and nothing has changed.

fiona 1.8.6
gdal 2.4.2
vs2015_runtime 14.16.27012