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E2451: Undefined symbol 'identifier' (C++)

The named identifier has no declaration. 

Possible Causes

  • Actual declaration of identifier has been commented out.
  • Misspelling, either at this point or at the declaration.
  • An error in the declaration of the identifier.
  • The header file in which the identifier is declared was not included using #include
Tools to help track down the problem: 

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