Hi, I ran into this error and not sure how to fix it.  I develop a new module and install into the system manually (create new module definition).  Then, I found other things went wrong and I decide to restore the database to original state.  However, one of the container always displays the following error.  I went to the dnn_Tabs and dnn_TabModules, I couldn't find the module (491) in the tab (36), and the page keeps complaining it.  So, my question is, when you add a module to the tab, when does the information get writing to beside database?  Does DotNetNuke use any file system for caching purpose?

Store settings are not defined.
DotNetNuke.Services.Exceptions.ModuleLoadException: ModuleID 491 does not exist on TabID 36. ---> System.ApplicationException: ModuleID 491 does not exist on TabID 36. at DotNetNuke.Modules.Store.Components.SettingsWrapper..ctor(Int32 moduleId, Int32 tabId) at DotNetNuke.Modules.Store.Catalog.ModuleSettings..ctor(Int32 moduleId, Int32 tabId) at DotNetNuke.Modules.Store.WebControls.CatalogPortal.Page_Load(Object sender, EventArgs e)

You are right on the spot.  Thanks for saving my time.