Can't Do Anything on MacVim

[jeffreyyong]

My MacVim just crashes and it doesn't allow me to do anything. The error messages are:

Fatal Python error: Py_Initialize: unable to load the file system codec ModuleNotFoundError: No module named 'encodings'

Current thread 0x00007fff756eb000 (most recent call first): Vim: Caught deadly signal ABRT Vim: preserving files... Vim: Finished.

I'm wondering if this is related to the Python version on my Mac?

[alecshaw]

Reproduced. Homebrew just updated to Python 3.6.3, and now this is happening.

When launching from the command line, the error @jeffreyyong reported is shown. When launching from the Finder, the app opens but no window is drawn. Attempting to open new windows doesn't draw anything, but when quitting, I was prompted about closing multiple windows.

Update: Installing the development version of Python (3.7.0a1) with Homebrew (brew upgrade python3 --devel) fixes the problem, and MacVim works as before. I suspect there is a problem with the Homebrew formula, although I don't yet know how to diagnose that.

macOS 10.13
Python 3.6.3
MacVim 8.0-137

[splhack]

Updated https://github.com/macvim-dev/macvim/releases/tag/snapshot-138
Please reopen if still happening with snapshot 138 binary.

[alecshaw]

Everything appears to work great. Strangely, the old version in Homebrew (snapshot 137_2) works fine today, but I've gone ahead with snapshot-138 from the cask version.
Thanks for the quick response.

[JoelOliva]

After updating MacVim today I was getting the same error. I was able to fix it by following alecshaw's solution and upgrading to the development version of python.

[sun-rongyang]

After updating MacVim to 145 today, I met the same problem. I solved it by upgrading python3 to 3.6.4 using HomeBrew.

[jetsgit]

Having similar problem.
I am on python 3.6.4, and using MacVim 145. However none of above solutions solved my problem.
I found this in my make log:
Could not find service "com.apple.CoreSimulator.CoreSimulatorService"
On further research I found similar issue referenced at

https://trac.macports.org/ticket/49950
Solution was to:

sudo chmod 755 /Applications/Xcode.app/Contents/Developer/Library/PrivateFrameworks/CoreSimulator.framework/Versions/A/XPCServices/com.apple.CoreSimulator.CoreSimulatorService.xpc
This fixed my issue, and I was then able to do a
brew install macvim

[JonRowe]

I had a similar issue, brew reinstall macvim --env-std --with-override-system-vim seems to have fixed it.

[FuDesign2008]

brew install macvim --build-from-source works for me