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alchemyalchemy 

error

using my apex code when i fill in all the details for a record then on the click of save button i am saving the details and then moving to the next page. in the next page i am entering more details. but on the next page i am getting the following url

 

https://c.cs6.visual.force.com/apex/ClientMemberDetails?entityId=null&tabname=Financial+Planning

i am not understanding y is the entityId coming as null.....            

 then when i try to enter details i get the error as  follows

 

  System.StringException: Invalid id: null 

 

Class.ClientMemberDetailsController.AddNewMember: line 111, column 13 External entry point

   why is it happening like this........