Application error when access /_layouts/15/EditProperty.aspx, Error=AccessKey too long

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

Application error when access /_layouts/15/EditProperty.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.InputFormCheckBox.set_AccessKeyLocId(LocStringId value)
at ASP._layouts_15_editproperty_aspx.__BuildControlchkboxIsVisibleOnViewer()
at ASP._layouts_15_editproperty_aspx.__BuildControlInputFormSectionFieldArea4()
at ASP._layouts_15_editproperty_aspx.__BuildControlSection4()
at ASP._layouts_15_editproperty_aspx.__BuildControlInputForm1()
at ASP._layouts_15_editproperty_aspx.__BuildControl__control7(Control __ctrl)
at System.Web.UI.MasterPage.InstantiateInContentPlaceHolder(Control contentPlaceHolder, ITemplate template)
at ASP._admin_admin_master.__BuildControlPlaceHolderMain()
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.get_Master()
at System.Web.UI.Page.ApplyMasterPage()
at System.Web.UI.Page.PerformPreInit()
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

You also might have experienced the slight disfigurement of UI Search/Content Source configuration screen:
The Ok and Cancel button label changed.

The problem is related to temporary files. The workaround is to delete temporary files on CA server and let .NET framework rebuild the executable. To fix the issue follow the steps below:
1. Stop IIS: iisreset /stop
2. Delete the content of the following folder:
C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files
3.Start IIS: iisreset /start


  1. Krunal Mehta

    A small correction in the resolution:
    3.Start IIS: iisreset /stop

    Correction: Instead stop it should be start : iisreset /start


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