LINQ query with Aggregate Error!!

[Ubuntu]

Dear All,
    I have this Linq query to combine a list of values (Names) form the child table into one string
    

team.TeamMembers.Where(o => o.TeamId == team.ID).Select(i => i.Member.Name).Aggregate((x, y) => x + y)

    the result is taken to a string properity on the returned class.
    When I preview the report I got this error:
    

An error has occurred while processing Report 'TeamFollowUp': An error occurred while invoking data retrieval method. Try restarting VisualStudio.
------------- InnerException -------------
Exception has been thrown by the target of an invocation.
------------- InnerException -------------
LINQ to Entities does not recognize the method 'System.String Aggregate[String](System.Collections.Generic.IEnumerable`1[System.String], System.Func`3[System.String,System.String,System.String])' method, and this method cannot be translated into a store expression.

    
How can I correct this ...!!!

Regards