У объекта Err есть свойство Source- может поможет (хотя вряд ли)
Returns or sets astring expression specifying the name of the object or application that originally generated the error. Read/write.

Remarks

The Source property specifies a string expression representing the object that generated the error; theexpression is usually the object'sclass name or programmatic ID. Use Source to provide information when your code is unable to handle an error generated in an accessed object. For example, if you access Microsoft Excel and it generates a Division by zero error, Microsoft Excel sets Err.Number to its error code for that error and sets Source to Excel.Application.

When generating an error from code, Source is your application’s programmatic ID. Forclass modules, Source should contain a name having the form project.class. When an unexpected error occurs in your code, the Source property is automatically filled in. For errors in astandard module, Source contains theproject name. For errors in a class module, Source contains a name with the project.class form.

А лучше пройтись по коллекции Query и поискать в ней твой текст.

1.Поставь останов в Form_Load и иди по шагам
2.Tools->Analize->Documenter