Error detected while processing function UltiSnips#TrackChange when hitting a function key in insert mode

[mgedmin]

Every time I hit an unmapped function key in insert mode, I get this:

Error detected while processing function UltiSnips#TrackChange:                                                                             
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Traceback (most recent call last):
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Error detected while processing function UltiSnips#TrackChange:
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  File "/home/mg/.vim/bundle/UltiSnips/pythonx/UltiSnips/err_to_scratch_buffer.py", line 16, in wrapper
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Error detected while processing function UltiSnips#TrackChange:
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    return func(self, *args, **kwds)
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Error detected while processing function UltiSnips#TrackChange:
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  File "/home/mg/.vim/bundle/UltiSnips/pythonx/UltiSnips/snippet_manager.py", line 838, in _track_change
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Error detected while processing function UltiSnips#TrackChange:
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    inserted_char = _vim.eval('v:char')
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Error detected while processing function UltiSnips#TrackChange:
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  File "/home/mg/.vim/bundle/UltiSnips/pythonx/UltiSnips/_vim.py", line 121, in eval
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Error detected while processing function UltiSnips#TrackChange:
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    rv = vim.eval(as_vimencoding(text))
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Error detected while processing function UltiSnips#TrackChange:
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UnicodeDecodeError: 'utf-8' codec can't decode byte 0xba in position 0: invalid start byte
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Error detected while processing function UltiSnips#TrackChange:
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During handling of the above exception, another exception occurred:
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Error detected while processing function UltiSnips#TrackChange:
line    1:
Press ENTER or type command to continue
Error detected while processing function UltiSnips#TrackChange:
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Traceback (most recent call last):
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Error detected while processing function UltiSnips#TrackChange:
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  File "<string>", line 1, in <module>
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Error detected while processing function UltiSnips#TrackChange:
line    1:
  File "/home/mg/.vim/bundle/UltiSnips/pythonx/UltiSnips/err_to_scratch_buffer.py", line 50, in wrapper
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Error detected while processing function UltiSnips#TrackChange:
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    _vim.new_scratch_buffer(msg)
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Error detected while processing function UltiSnips#TrackChange:
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  File "/home/mg/.vim/bundle/UltiSnips/pythonx/UltiSnips/_vim.py", line 157, in new_scratch_buffer
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Error detected while processing function UltiSnips#TrackChange:
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    vim.command('botright new')
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Error detected while processing function UltiSnips#TrackChange:
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vim.error: Vim(new):E523: Not allowed here: botright new
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I'm using Vim 8.0.311 built with Python 3 support.

[mgedmin]

I should've git pulled before filing the bug -- this is fixed in 5352d98f212e273b3e8b1d84efdbe2d6a6d557e9.

[hoetmaaiers]

I still have this issue and have ran 'PluginUpdate' (Vundle). How should I fix this? The error started when I updated Vim from native MacOS to Homebrew based version (8.0).

[ttcremers]

@hoetmaaiers are you sure you're using the vim from your Cellar directory? I just solved this issue by installing the brew version of vim version 8.0.

readlink `which vim` 

[hoetmaaiers]

@ttcremers very sure, this the output: ../Cellar/vim/8.0.0636/bin/vim

[dimanyc]

having this same issue every time I try to edit a commit message

[risentveber]

@dimanyc I've solved this problem for me by git config --global core.editor "vim --noplugin"