Magento 2 – Error – Exception #0 (LogicException): Unable to load theme by specified key: ‘4’

After renaming a custom Magneto 2 theme folder, to correct a capitalisation mistake, I ran into all sorts of issues, starting with this error:

Required parameter ‘theme_dir’ was not passed

After reading around I removed the entry from the database table “themes” and tried to set any pages or stores set to use that theme to use something else.  Then I endlessly got this:

Error – Exception #0 (LogicException): Unable to load theme by specified key: ‘4’

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Magento 2: Command Line Interface Reference

MAGENTO 2 – COMMAND LINE INTERFACE

M2 utilises CLI (command line interface) commands heavily from using composer to install modules and keep things updated to clearing the cache, switching in and out of production mode and that sort of thing.  This is very new for a Magento 1 developer like myself so it is time to start documenting all of this. Here is a list of the all the standard bin/magento commands, plus a few extra bits and pieces that have proved useful.

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