After I upgrade the Latest SP1 released(http://www.microsoft.com/en-us/download/details.aspx?id=42544),The PSconfig failes at last Step but still I can able to access the central admin.when I open the Sharepoint managent shell I see the below Error.PLease guide me on this.
Method 'get_IsClientValid' in type 'Microsoft.SharePoint.WorkflowServices.Workfl
owServiceApplicationProxy' from assembly 'Microsoft.SharePoint.WorkflowServices,
Version=15.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c' does not ha
ve an implementation.
Is there any preresuise before installing SP1?