Unknown Identifier <Identifier>

Description

The code contains invocation of an identifier that cannot be recognized be the compiler.

This error can be caused by a number of factors. To resolve the error, check the following:

The identifier contains a syntax error.
The variable or constant with the specified identifier has not been declared in the appropriate block Var/Const.
The invoked member is implemented in an assembly not linked to the current assembly.
The visibility scope of the invoked member does no allow this member to be invoked in this place of the code.
The current context does not allow for member invocation (for example, a constructor is invoked without using the New keyword).