Here is a Zend framework 3 error that you might get once or twice. It would look something like this;

Fatal error: Uncaught exception ‘Zend\ModuleManager\Exception\RuntimeException’ with message ‘Module (ModuleName) could not be initialized

Here is how to solve it.

1. Make sure the module is present in project name/config/modules.config.php. For example

2. Check that the module is in the composer.json file. For example

3. Next run composer update

That solves the problem.

Thanks for your time.