--trace error
When trying to run bundle exec jekyll s, the following error might arise
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$ bundle exec jekyll s
...
------------------------------------------------
Jekyll 4.2.0 Please append `--trace` to the `serve` command
for any additional information or backtrace.
------------------------------------------------
...
This solution might work:
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$ gem "webrick", "~> 1.7"
Close correctly with Ctrl-C
The error might arise also when not closing the previous job correctly, so it is busy to open a new job. Here is a solution that worked for me:
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$ lsof -wni tcp:4000
$ kill -9 <thePID>