Non-default solver backend (libmamba)

How do I fix this:
(base) murraycantor@Mac-mini ~ % conda create --name myenv10 python=3.10
Error while loading conda entry point: conda-libmamba-solver (dlopen(/Users/murraycantor/opt/anaconda3/lib/python3.9/site-packages/libmambapy/, 0x0002): Library not loaded: @rpath/libarchive.19.dylib
Referenced from: <2FB9B657-7481-3BB3-9E09-387CC7C0B13E> /Users/murraycantor/opt/anaconda3/lib/libmamba.2.0.0.dylib
Reason: tried: ‘/Users/murraycantor/opt/anaconda3/lib/libarchive.19.dylib’ (no such file), ‘/Users/murraycantor/opt/anaconda3/lib/python3.9/site-packages/libmambapy/…/…/…/libarchive.19.dylib’ (no such file), ‘/Users/murraycantor/opt/anaconda3/lib/python3.9/site-packages/libmambapy/…/…/…/libarchive.19.dylib’ (no such file), ‘/Users/murraycantor/opt/anaconda3/bin/…/lib/libarchive.19.dylib’ (no such file), ‘/Users/murraycantor/opt/anaconda3/bin/…/lib/libarchive.19.dylib’ (no such file), ‘/usr/local/lib/libarchive.19.dylib’ (no such file), ‘/usr/lib/libarchive.19.dylib’ (no such file, not in dyld cache))

CondaValueError: You have chosen a non-default solver backend (libmamba) but it was not recognized. Choose one of: classic

Hi, I have had the same exact error since yesterday after updating my miniconda environment. Please someone help as soon as possible.

I had same problem on M2 Macmini. I fixed this problem following procedure today.

  1. Search “libarchive.19.dylib” by Spotlight
  2. 3 files were catched in my M2 Macmini, so I copied the latest version among them.
  3. Pasted the latest version file mention above to the directory which was indicated in the command line.
    (In your case, “/Users/murraycantor/opt/anaconda3/lib/”)
    This procedure fixed the problem.
    I hope that my experience will give your solution.