i've got a strange error when using the migedir

Source : NW6.5 SP8 Edir 8.8 sp5 patch 3
Target : SLES 10SP3 x64 Full patched OES2SP2aX64 Edir885p3

i'm using miggui.with transferID

at the DIB copy, i've got error :

migedir.ERROR: Not able to get the default Language ID of the source server

thanks for help