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AccessKey too long, cannot be more than one character - SharePoint 2013 with March 2018 update

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After installing March 2018 update for SharePoint 2013 you may get this error when trying to configure sync in User Profile Service Application:

 

Application error when access /_layouts/15/ProfileSynchronizationServiceProvisionPage.aspx, Error=AccessKey too long, cannot be more than one character. Parameter name: value at System.Web.UI.WebControls.WebControl.set_AccessKey(String value) at Microsoft.SharePoint.Portal.WebControls.InputFormButtonAtBottom.set_AccessKeyLocId(LocStringId value) at ASP._layouts_15_profilesynchronizationserviceprovisionpage_aspx.__BuildControl__control11() at ASP._layouts_15_profilesynchronizationserviceprovisionpage_aspx.__BuildControlProfileSyncProvisionSettingsForm() at ASP._layouts_15_profilesynchronizationserviceprovisionpage_aspx.__BuildControl__control4(Control __ctrl) at System.Web.UI.MasterPage.InstantiateInContentPlaceHolder(Control contentPlaceHolder, ITemplate template) at ASP._admin_admin_master.__BuildControlDeltaPlaceHolderMain() at ASP._admin_admin_master.__BuildControl__control27() at ASP._admin_admin_master.__BuildControlSPHtmlTag() at ASP._admin_admin_master.__BuildControlTree(_admin_admin_master __ctrl) at System.Web.UI.MasterPage.CreateMaster(TemplateControl owner, HttpContext context, VirtualPath masterPageFile, IDictionary contentTemplateCollection) at System.Web.UI.Page.ApplyMasterPage() at System.Web.UI.Page.PerformPreInit() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

 

Solution: clear ASP.net temporary files, then perform IISRESET.