EInvalidOperation is the exception class for invalid operations on a component.
EInvalidOperation = class(Exception);
class EInvalidOperation : public Exception;
Classes
EInvalidOperation is raised when an application attempts an operation that requires a window or widget handle on a component that does not have a parent (The Parent property is Nil in Delphi or NULL in C++). This exception can also occur if a drag-and-drop operation is attempted from a form (for example, when calling the BeginDrag method of a form).
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Class Hierarchy