Cannot find implementation of method <MethodName>
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The indicated method is declared in the form's class declaration but cannot be located in the implementation section of the unit. It probably has been deleted, commented out, renamed, or incorrectly modified.
Use UNDO to reverse your changes, or correct the procedure declaration manually. Be sure the declaration in the class is identical to the one in the implementation section. (This is done automatically if you use the Object Inspector to create and rename event handlers.)