Do you not think that it would be useful to show the code that's causing the problem?
In any case, I'm inferring that you are using the <fmt:message> (or related) tag and that means that the property could not be found in the bundle (or that the bundle itself was not found).
Just like what you say, following is the sample code from my project. And I check the locale property file, the property "page.column1.sponsor" is there.