System.Exception: Assertion failed: DeterminePageIndex(): 'currentPage' may not be null!
   at Vivace.Library.Utils.Assert.Fail(Func`1 trueAssertion, String message) in D:\Accelerate Education\build\git\vivace\Vivace.Solution\Stumptown.Library\VivaceSmash\Utils\Assert.cs:line 19
   at Vivace.Library.Cms.Factories.PublishedPageFactory.DeterminePageIndex(List`1 pages, DisplayContextType displayContextType, IPublishedPage currentPage, String templateAbbreviation) in D:\Accelerate Education\build\git\vivace\Vivace.Solution\Stumptown.Library\VivaceSmash\Cms\Factories\PublishedPageFactory.cs:line 607
   at Vivace.Library.Cms.Factories.PublishedPageFactory.ConstructPageContextForLearningObject(String learningObjectId, String pageId, DisplayContextType displayContextType, String templateAbbreviation, UrlBundle bundle, StrandType strand) in D:\Accelerate Education\build\git\vivace\Vivace.Solution\Stumptown.Library\VivaceSmash\Cms\Factories\PublishedPageFactory.cs:line 478
   at Vivace.Library.Cms.Factories.PublishedPageFactory.GetPublishedPageForLearningObject(Site site, String learningObjectId, String pageId, DisplayContextType displayContextType, String template, UrlBundle bundle, StrandType strand, Nullable`1 workflow) in D:\Accelerate Education\build\git\vivace\Vivace.Solution\Stumptown.Library\VivaceSmash\Cms\Factories\PublishedPageFactory.cs:line 201
   at Vivace.Ideal.Controllers.LessonController.CreatePublishedPageModel(String learningObjectId, String pageId, String template, UrlBundle bundle, String strandAbbreviation, Nullable`1 workflowType, Boolean speechstream, String speechstreamMode, String lmsContextId, String lmsUserId, Int32 studentTools) in D:\Accelerate Education\build\git\vivace\Vivace.Solution\Vivace.Ideal\Controllers\LessonController.cs:line 1104
   at Vivace.Ideal.Controllers.LessonController.DisplayFullyQualifiedPublishedPage(String template, String bundle, String lessonId, String pageId, String strandAbbreviation, Nullable`1 workflowType, Boolean speechStream, String speechStreamMode, String lmsContextId, String lmsUserId, Nullable`1 studentTools) in D:\Accelerate Education\build\git\vivace\Vivace.Solution\Vivace.Ideal\Controllers\LessonController.cs:line 598