SSDT no avaible input column error

i am learning SSDT from this link https://msdn.microsoft.com/en-us/library/jj819740(v=sql.120).aspx on point 8 i stuck before that i install DQS successfully and also connected to Data Quality service client now when i check in MS SQL 2014 there is 3 database created DQS_MAIN,DQS_PROJECT,DQS_STAGING_dATA now when i follow point 8 and click on mapping tab this shows an error any solutions please?