EEXIST 17 error while installing opencv using conda on windows - opencv

Question

I am trying to install opencv using conda on a windows machine. I am running the following command:
conda install --channel https://conda.anaconda.org/menpo opencv
and getting the following error:
Solving environment: done
## Package Plan ##
environment location: C:\ProgramData\Anaconda2
added / updated specs:
- opencv
The following NEW packages will be INSTALLED:
opencv: 2.4.11-py27_1 menpo
Proceed ([y]/n)? y
Preparing transaction: done
Verifying transaction: done
Executing transaction: - WARNING conda.gateways.disk:exp_backoff_fn(49):
Uncaught backoff with errno EEXIST 17
failed
ERROR conda.core.link:_execute(502): An error occurred while installing
package 'None'.
IOError(13, 'Permission denied')
Attempting to roll back.
Rolling back transaction: done
IOError(13, 'Permission denied')
WindowsError(183, 'Cannot create a file when that file already exists')
Other people seem to have similar problems (https://github.com/conda/conda/issues/4393). One of the solutions I found was to downgrade conda. I am currently using conda 4.5.4 and when I try to downgrade using conda install conda=4.2 I get the following error:
The following packages will be DOWNGRADED:
conda: 4.5.4-py27_0 --> 4.2.16-py27_0
conda-build: 3.10.5-py27_0 --> 3.9.2-py27_0
Proceed ([y]/n)? y
Preparing transaction: done
Verifying transaction: done
Executing transaction: failed
ERROR conda.core.link:_execute(502): An error occurred while uninstalling
package 'defaults::conda-build-3.10.5-py27_0'.
WindowsError(5, 'Access is denied')
Attempting to roll back.
Rolling back transaction: done
WindowsError(5, 'Access is denied')
Regarding this issue I found the following similar posts:
conda update conda permission error
Anaconda : Update conda failed because permission error
But the solutions given do not fix my problem.

Answer 1

I also had a problem with installation and usage of the OpenCV library. If you have such а problem, you can try:
uninstall opencv with: conda remove --yes opencv (in case you have an installation but it does not work properly)
install OpenCV through pip: pip install opencv-python
I think this is a problem with opencv that comes from Anaconda channels. I came across this problem four months ago. Тhe problem may be resolved right now.

Answer 2

My guess is that you did not run this command with administrator privileges！