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Trying to run this very simple operation and getting exception as in title:

list<workorder> o = [select id from workorder];

Wat?

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Generally this type of error occur when there are 2 different type of class has the same same. so the Name is same but signature is different. I am from salesforce apex so I can suggest you to check for your metadata whether there are any 2 same name class/settings/object exist in your system.

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    WorkOrder is a standard object and @dzh might be having a class with same name (as you have mentioned). But two classes cannot have same name. In such cases, system gets confused and uses the defined class. – Raul Oct 25 '16 at 7:02
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    He might created a Wrapper class with name 'WorkOrder' ? This often happens. – Pranay Jaiswal Oct 25 '16 at 7:03
  • Ah yes must be it. Hits me twice this month - someone created class test recently and out of the sudden all tests started failing. Lol! – dzh Oct 25 '16 at 7:41
  • For all the System classes, you can maybe append 'System.' to avoid such issues. like. System.Trigger.new instead of Trigger.new – Raul Oct 25 '16 at 7:43

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