Sorted:

I want to return a function of vector<Competition> but is told that Competition is undeclared and that I am using undefined class 'std::vector'-Collection of common programming errors

Require Once Generates Errors in Kohana v3.3.1-Collection of common programming errors

C error – undefined reference to pow in Eclipse IDE – can use it in 'main' function but not in others. I AM using “-lm” compiler flag [closed]-Collection of common programming errors

Send app request to facebook friends in Android-Collection of common programming errors

Java Error: The method getMethod(String, Class<boolean>) is undefined for type Class-Collection of common programming errors

Facebook PHP SDK throws uncatchable “GraphMethodException” error-Collection of common programming errors

PHP Error: Undefined offset error within foreach loop-Collection of common programming errors

problem about winmain-Collection of common programming errors

problem about windows-workflow-foundation-Collection of common programming errors

problem about visual-c-mfc-and-atl-Collection of common programming errors