bestbets Not working.

Hi,

I am working with EPiserver 11.

While applying bestbets to website, I am getting error. please find error details below.

Unable to load /Find/api/bestbets/ status: 500

"{"Message":"An error has occurred.","ExceptionMessage":"PageReference: Input string was not in a correct format.","ExceptionType":"EPiServer.Core.EPiServerException","StackTrace":" at EPiServer.Core.PageReference.Parse(String s)\r\n at EPiServer.Find.Cms.PageBestBetSelector.Parse(String input, String language)\r\n at EPiServer.Find.UI.BestBetManager.GetBestBetSelector(String targetKey, String targetTypeName, String language)\r\n at EPiServer.Find.UI.BestBetManager.Create(String id, BestBetModel model)\r\n at EPiServer.Find.UI.Controllers.BestBetsController.Put(String id, BestBetModel input)"}"

Thank you,

Amol