System.Exception: Exception while creating a value. ---> System.NullReferenceException: Object reference not set to an instance of an object.
   at Heyday.UmbracoCms.Site.Code.Services.InstagramService.GetToken() in D:\a\1\s\Heyday.UmbracoCms.Site\Code\Services\InstagramService.cs:line 57
   at Umbraco.Core.Cache.DictionaryCacheProviderBase.<>c__DisplayClass10_0.<GetSafeLazy>b__0()
   --- End of inner exception stack trace ---
   at Umbraco.Core.Cache.HttpRuntimeCacheProvider.GetCacheItemInternal(String cacheKey, Func`1 getCacheItem, Nullable`1 timeout, Boolean isSliding, CacheItemPriority priority, CacheItemRemovedCallback removedCallback, Func`1 dependency)
   at Umbraco.Core.Cache.HttpRuntimeCacheProvider.GetCacheItem(String cacheKey, Func`1 getCacheItem, Nullable`1 timeout, Boolean isSliding, CacheItemPriority priority, CacheItemRemovedCallback removedCallback, String[] dependentFiles)
   at Umbraco.Core.Cache.DeepCloneRuntimeCacheProvider.GetCacheItem(String cacheKey, Func`1 getCacheItem, Nullable`1 timeout, Boolean isSliding, CacheItemPriority priority, CacheItemRemovedCallback removedCallback, String[] dependentFiles)
   at Heyday.UmbracoCms.Site.Code.Services.InstagramService.GetCachedMedia(String businessId, String accessToken, String hashtag, Int32 mediaNumber) in D:\a\1\s\Heyday.UmbracoCms.Site\Code\Services\InstagramService.cs:line 27
   at ASP._Page_Views_Partials_Module_InstagramList_instagramList_cshtml.Execute() in F:\inetpub\8871da\Views\Partials\Module\InstagramList\instagramList.cshtml:line 6
   at System.Web.WebPages.WebPageBase.ExecutePageHierarchy()
   at System.Web.Mvc.WebViewPage.ExecutePageHierarchy()
   at System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage)
   at Umbraco.Core.Profiling.ProfilingView.Render(ViewContext viewContext, TextWriter writer)
   at System.Web.Mvc.Html.PartialExtensions.Partial(HtmlHelper htmlHelper, String partialViewName, Object model, ViewDataDictionary viewData)
   at Our.Umbraco.DocTypeGridEditor.Web.Extensions.HtmlHelperExtensions.RenderDocTypeGridEditorItem(HtmlHelper helper, IPublishedContent content, String editorAlias, String viewPath, String previewViewPath) in D:\a\1\s\Our.Umbraco.DocTypeGridEditor\Web\Extensions\HtmlHelperExtensions.cs:line 97
   at ASP._Page_app_plugins_doctypegrideditor_render_doctypegrideditor_cshtml.Execute() in F:\inetpub\8871da\app_plugins\doctypegrideditor\render\doctypegrideditor.cshtml:line 29
   at System.Web.WebPages.WebPageBase.ExecutePageHierarchy()
   at System.Web.Mvc.WebViewPage.ExecutePageHierarchy()
   at System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage)
   at Umbraco.Core.Profiling.ProfilingView.Render(ViewContext viewContext, TextWriter writer)
   at System.Web.Mvc.Html.PartialExtensions.Partial(HtmlHelper htmlHelper, String partialViewName, Object model, ViewDataDictionary viewData)
   at ASP._Page_Views___Default___Partials_grid_editors_base_cshtml.Execute() in F:\inetpub\8871da\Views\__Default__\Partials\grid\editors\base.cshtml:line 20