subscript out of range- datagrid

dear all, i am a beginner in VB. When i put objects, datagrid and command button to form, and i put some codes to command1_click() like this
datagrid1.columns(0).caption ="Name"
datagrid1.columns(1),caption="Address"
datagrid1.columns(2).caption="occupation"
datagrid1.columns(3).caption="Age"
when i click command1 there is an error message (run-time error 9) : "subscript out of range"
my questions are ; why could it happens and what's the solution