I have checked the event log and its showing below message.
I have imported this webpart from site/import. the webpart is showing in the cms but not exists physically in the custom table folder.
Message: The file '/CMSWebParts/CustomTables/CustomTableInputEdit.ascx' does not exist.
Exception type: System.Web.HttpException
Stack trace:
at System.Web.UI.Util.CheckVirtualFileExists(VirtualPath virtualPath)
at System.Web.Compilation.BuildManager.GetVPathBuildResultInternal(VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile, Boolean throwIfNotFound, Boolean ensureIsUpToDate)
at System.Web.Compilation.BuildManager.GetVPathBuildResultWithNoAssert(HttpContext context, VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile, Boolean throwIfNotFound, Boolean ensureIsUpToDate)
at System.Web.UI.TemplateControl.LoadControl(VirtualPath virtualPath)
at CMS.Base.Web.UI.ControlDefinition.Load(Page page)
at CMS.Base.Web.UI.ControlsExtensions.LoadUserControl(Page page, ControlDefinition control)
at CMS.PortalEngine.Web.UI.CMSWebPartZone.LoadWebPart(Control container, CMSWebPartZone zone, WebPartInstance part, Boolean reloadData, Boolean isVariant)