Drush error when running dmu-analyze to update drupal modules
One of the modules in your installation is incorrectly using references to services without quoting them.

e.g.

[@container.namespaces]


instead of the valid: 

['@container.namespaces']


The error message doesn't provide enough details to be able to identify which module is causing the problem. It's going to be a contrib/custom one, though, so check the .services.yml file for the extra modules you have installed and you should find the culprit. It's likely to be under a service whose name begins with plugin.manager..