What does that mean "bar pack error" ?

 

Founded in the Journal log :

2013.05.28 23:04:08    History    'CADJPY' bar pack error [0]

Chart opened on CADJPY H1, from 2013.05.27 00:00

Seems I have regularly this error :

2013.05.20 23:08:44    History    'CADJPY' bar pack error [0]
2013.05.22       
2013.05.22 23:04:11    History    'CADJPY' bar pack error [0]
2013.05.23       
2013.05.23 23:03:01    History    'CADJPY' bar pack error [0]
2013.05.27       
2013.05.28       
2013.05.28 23:04:08    History    'CADJPY' bar pack error [0]

Reason: