Use friendly exception

[np25071984]

Q	A
Is bugfix?	❌
New feature?	✔️
Breaks BC?	❌
Fixed issues	#324

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (56168c3) to head (3447fdc).

Additional details and impacted files

@@             Coverage Diff             @@
##              master      #386   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
- Complexity       165       167    +2     
===========================================
  Files             11        11           
  Lines            480       486    +6     
===========================================
+ Hits             480       486    +6     

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[np25071984]

Not sure if #234 and #324 are equal

[samdark]

Let's think about what could cause it:

1. Class wasn't found.
2. Config wasn't valid.
3. What else?

I'd provide a list of things to try, such as:

1. Ensure that either a service with ID "x" is defined or such class exists and is autoloadable.
2. Ensure that configuration for service with ID "x" is correct.

Docs are not suggesting on how to fix errors.