Yaml is awesome. One of the ruby parsers Yaml is named Syck. It’s awesome, but most of the time you’re not dealing with it directly. You install a gem and get an error regarding Syck, but its just a dependency of one of the gems.

In my case it was:

NoMethodError: undefined method `write' for #

The quick solution to this is to set your RUBYOPT environment variable:

RUBYOPT='-rpsych' bundle install

The reason behind this is that YAML automatically uses the older Syck library unless Psych is loaded before YAML.

NoMethodError: undefined method `eq’ for nil:NilClass
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