[LAU] Ardour error - you cannot use colons to name objects with I/O connections -

Hi , i've got this message from ardour 2.1 when open a session with two tracks : [WARNING]: you cannot use colons to name objects with I/O connections I bring this session from another machine , where I did the recording , to this one where from I'm writing now , in an SD card with Fat file system. Also , Jack produce tons of xruns untill it die. The session has two streo tracks with diferent regions for each take . The souncards are the same in both machines (Terratec DMX6 Fire - ice1712 ) . Here is a screenshot of the issue. http://www.imaxenes.com/imagen/ardour_error1lk83py.png.html It only happens with this session , I have some others with more tracks and effects and everything works great . Linux ubuntuStudio 2.6.22-14-rt #1 SMP PREEMPT RT Tue Dec 18 10:01:34 UTC 2007 i686 GNU/Linux Jack 0.103 , Ardour-2.1 , in a Pentium IV 2.6 Ghz with 1gb of RAM . Any idea? Thanks a lot .