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phpstorm

Undefined class if class is in different namespace

I have a yii2 project set up on phpstorm 8.0.3. My namespace structure is as follows:

backend\
  controllers
  models
  ...
frontend\
  controllers
  models
  ..
common\
  controllers
  models

I used composer on the project and have various dependancies installed in the vendor folder.

Whenever I try to use a class that is not in the same base namespace (frontend, backend or common), I get an undefined class error. The odd thing is the namespace of the class is in autocomplete:

enter image description here

Another oddity is that the undefined class error disappears for some classes if the file with the defined class is opened.

Solution

  • It looks like the PHPStorm cache was somehow corrupted. I ended up invalidating the cache by going to File -> Invalidate Caches/Restart. This deleted my history but fixed the undefined class issue.