Bundler::GemRequireError: There was an error while trying to load the gem 'mysql2'.
Gem Load Error is: Incorrect MySQL client library version! This gem was compiled for 5.5.46 but the client library is 5.6.30.

Same as in Fix "libmysqlclient.so.20: cannot open shared object file: No such file or directory":

gem pristine mysql2

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gem pristine re-installs a gem (without re-downloading), re-compiling all native extensions in the process.