[SOLUTION] Upgrading Joomla from 3.6 to 3.7 “404 component not found” error

ЕImmediately after upgrading Joomla from 3.6.x to 3.7.x the main error pops up:

404 Component not found

How to solve this problem:

1) make a rollback to a backup before the update (if there is no possibility – manually transfer the database and files to a fresh installation of Joomla and manually install all the components).
2) _before update_ (this is important!) go to the main menu of admin area: Extensions -> Extension Manager -> Search
3) select everything there (or just all “Fields” if you don’t know what’s what; most likely the problem is because of them) and click “Install” (top left).
4) go to “Extensions” -> “Extension Manager” -> “Databases”
5) Click “Fix”.

Now you can run the update, everything should go smoothly.
Attention! If in “Extensions” -> “Extension Manager” -> “Search” you don’t find anything, it means you’re searching _after_ you updated the system, and you should do it beforehand.
I’d be happy to hear your comments! 🙂

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