Problems wit Data

Hi, strange things happen to my gantt chart, for example task 1111, if I locate it with its childtasks in July instead of August, it works perfectly. But if I locate it as it is showed in the code below it shows the following error: Data_Error: Task(1111)EST<project (2) startdate.

Also I have notice in task 2222, that when I create a childtask with est in a different month of the parent task, it crashes as well.

Any ideas?

<?xml version='1.0' encoding='UTF-8'?> 1111 2011,08,10 422 16 Corte 2011,08,10 8 0 Bisel 2011,08,12 24 0 2222 2011,07,21 480 137 Corte 2011,07,28 100 0 Recepcion 2011,07,27 48 0 Biselado 2011,07,31 200 0 Curvado 2011,07,29 200 0

in dates like this 2011,07,12
please remove leading zeros - 2011,7,12