SQL Server 2014 In Memory Table Creation Error
i solved the problem with this link: http://www.yigitaktan.com/archives/492

The problem's source is that: Sql Server instance's collation was Turkish_CI_AS. Memory-Optimized processes haven't supported my collation. 

SELECT NAME AS [Collation]
    ,COLLATIONPROPERTY(NAME, 'codepage') AS [CodePage]
FROM sys.fn_helpcollations()
WHERE COLLATIONPROPERTY(NAME, 'codepage') = 1252 

This query lists supported collations.