DLL Load failed error

Developers
1

Has anyone had any experience with a “ImportError: DLL load failed while importing _arpack: The specified procedure could not be found.”?

The background is originally I installed Python 3.10 on my windows desktop computer and was using that quite happily although I could not install Cartopy.

I found that by installing Anaconda I could get python 3.9 installed with Cartopy and did that. After doing so, I found 3.10 was still reliable by 3.9 was not. Presumably the two versions weren’t happy together.

I installed anaconda and python 3.9 on my new laptop and it works fine, so I decided to unistall 3.10 on my desktop and concentrate on 3.9 with both Obspy and cartopy. Problems got worse, so I checked all PATH environment variable and got rid of references to the python 3.10 locations.

Eventually I uninstalled anaconda and reinstalled and set up Cartopy and Obspy again, but this error persists. It happens on all my reports.

The line in my program/module seems to be the “from obspy.signal import filter”. All the calls after that appear to be in modules outside my program.

Here’s a copy of the console output:

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I appreciate any help anyone can suggest. I haven’t yet sat down with my laptop to check it still works as it did last week, and check off versions of the various modules. I suspect it is something else as Anaconda is supposed to manage compatibility between the modules.

Al.

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For future reference I’ve solved this.

I found an entry in PYTHONPATH environment variable which was left over from my original PY3.10 installation that I’d missed when uninstalling. That didn’t fix the problem itself but I suspect messed up the Scipy install.

I then uninstalled Cartopy, Obspy and Scipy from the base environment in Anaconda, and then reinstalled Scipy only.

I then created a new environment for Obspy and Cartopy. This appears to be successful.

Al.

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Thank you for posting the solution to the problem sheeny.

In full honesty, it’s the first time I saw a DLL issue related to a Python package, but my suggestion would have been something along the line of “try to create a new environment and see if it happens again”.

Well done!

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As you know I’m relatively new to Python, but been programming in other languages on and off for about 45 years, so I know just enough to be dangerous! lol!

Al.

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