Since I installed Gallery 4.3.0 on my DNN 4.9.5 site, right after upgrading, I'm getting error messages in the event viewer that these two files don't exist:

/DesktopModules/Gallery/Viewer.aspx
/DesktopModules/Gallery/SlideShow.aspx

In fact, they don't exist - I checked on my site, and these files in that directory now have the extension .ascx.  But something in the code seems to be looking for a different file extension.  This doesn't show on the user interface, so I can ignore it if I have to, but I thought I should report it.

Certainly, here is the entire message from Event Viewer for one of these, inlcuding the stack trace; the URL referrer seems to be blank:

AssemblyVersion: 04.09.05
PortalID: 0
PortalName: Oakland Symphony Chorus
UserID: -1
UserName:
ActiveTabID: 118
ActiveTabName: Pictures from the Gala
RawURL: /DesktopModules/Gallery/Viewer.aspx?tabid=118&mid=689&path=&currentitem=1&currentstrip=1
AbsoluteURL: /DesktopModules/Gallery/Viewer.aspx
AbsoluteURLReferrer:
UserAgent: Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
ExceptionGUID: 2029da34-ee1a-492d-8d5e-80fbc59f9a47
InnerException: Unhandled Error:
FileName:
FileLineNumber: 0
FileColumnNumber: 0
Method: System.Web.UI.Util.CheckVirtualFileExists
StackTrace:
Message: System.Exception: Unhandled Error: ---> System.Web.HttpException: The file '/DesktopModules/Gallery/Viewer.aspx' does not exist. at System.Web.UI.Util.CheckVirtualFileExists(VirtualPath virtualPath) at System.Web.Compilation.BuildManager.GetVPathBuildResultInternal(VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile) at System.Web.Compilation.BuildManager.GetVPathBuildResultWithNoAssert(HttpContext context, VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile) at System.Web.Compilation.BuildManager.GetVirtualPathObjectFactory(VirtualPath virtualPath, HttpContext context, Boolean allowCrossApp, Boolean noAssert) at System.Web.Compilation.BuildManager.CreateInstanceFromVirtualPath(VirtualPath virtualPath, Type requiredBaseType, HttpContext context, Boolean allowCrossApp, Boolean noAssert) at System.Web.UI.PageHandlerFactory.GetHandlerHelper(HttpContext context, String requestType, VirtualPath virtualPath, String physicalPath) at System.Web.UI.PageHandlerFactory.System.Web.IHttpHandlerFactory2.GetHandler(HttpContext context, String requestType, VirtualPath virtualPath, String physicalPath) at System.Web.HttpApplication.MapHttpHandler(HttpContext context, String requestType, VirtualPath path, String pathTranslated, Boolean useAppConfig) at System.Web.HttpApplication.MapHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) --- End of inner exception stack trace ---
Source:
Server Name: EROSWEB

It appears that both errors are being logged when the site is being visited by Google's web bot which is apparently following old links which included references to the Gallery v 3.0.12 pop-ups Viewer.aspx, SlideShow.aspx and also ExifMetaData.aspx. I would suspect that once Google re-builds its links these errors will stop occuring.