On 27 Feb 2021, at 14:26, andreas.loeffler--- via TextMate wrote:

I am using Textmate for writing LaTex texts and I recently found that I can used a shortcut for completing environments (the help says "by default to cmd and < " but it turned out to be ctrl and <). Still, I get an error message that I did not find in the mailing list:
Failure running “Environment Based on Current Word”.
Users/andreasloeffler/Library/Application Support/TextMate/Managed/Bundles/LaTeX.tmbundle/Support/lib/Ruby/configuration.rb:29:in `load': Unexpected character { at line 1 (OSX::PropertyListError)

It appears to be loading ~/Library/Preferences/com.macromates.textmate.latex_config.plist and effectively reporting a parse error while doing so.

Try (re)move that file and see if that solves the problem.

Though make a copy, incase it contains customizations that you do not want to lose.