I am using the Expression Builder to verify the value entered in my textbox is not a duplicate in my query. In the Validation Rule property of the textbox, I have the expression:[class]<>[qryclassLookup]![class].

The error message -"The expression[qryclassLookup] you entered in the form control's Validation Rule property contains the error The Object doesn't contain the Automation object 'qryclassLookup'"

[class] is the input textbox in my form
[qryclassLookup] is the query where the data being written.
[qryclassLookup]![class] is the field in my query that I would like to verify with.

Please advice.