ehlpdhtm.js error

Since last week, I have this message: "The file "ehlpdhtm.js" used in "S1650000.htm", is outside of the current project and will not be shown in Project Manager.", every time I open the project, RoboHelp stop on every page I created with an HotSpot or a Drop Down on it or where I add an HotSpot or a Drop Down since last week. This represent about 200 pages of this project. It occurs every time when I add a new HotSpot or a Drop Down too! IThis RoboHelp project, was develop with RoboHelp x5, and I didn't ever have this error message before. What can I do? The project is about 4000 HTML files. I'm going crazy when I think if the only solution will be to modify manually the HTML code on every page where it occurs! Please help ...