Hi There,

All of sudden I am getting this exception previously it worked fine

Could not find the umbraco api controller of type Umbraco.Web.Editors.AuthenticationController

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.InvalidOperationException: Could not find the umbraco api controller of type Umbraco.Web.Editors.AuthenticationController

Source Error: 

Line 56:         Umbraco.Sys.ServerVariables = {
Line 57:             "umbracoUrls": {                
Line 58:                 "authenticationApiBaseUrl": "@(Url.GetUmbracoApiServiceBaseUrl(controller => controller.PostLogin(null)))",
Line 59:                 "serverVarsJs": '@Url.GetUrlWithCacheBust("ServerVariables", "BackOffice")'
Line 60:             }

Any help is appreciated..