Inheriting a required module [Error] - Trying to get an understanding

I have a GWT project where I created a folder named common for shared tasks. I tried a simple public static void testme() method doing a system out print line to see if it fires. 

When running I getting: 

[ERROR] [org.dash.board.Main] - Line 40: No source code is available for type org.dash.board.common.OutterClass; did you forget to inherit a required module?

I added to the gwt.xml:

<inherits name="org.dash.board"/> 

resulting in 

[ERROR] Unable to find 'org/dash/board.gwt.xml'

Only when I add the below does the system out print line fire. I guess my question is why does the compiler complain about inheritance when the fix is not inheriting anything? 

  <source path='client'/>

  <source path='common'/>

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