Dear lahraf, thank you for your help \(^o^)/~ I can understand how hard for you to manipulate this forum... The google translation is not so smart sometimes
The problem has been solved now. I have downloaded hlm 7.0 (the student edition), and it can read the .sav data created by SPSS 21.0. Maybe there are some problems with the interface between SPSS and hlm 6.
Thank you for helping me and look forward to your email \(^o^)/~
Have a nice day {:soso_e112:}