Runtime Error in ALV Tree Output

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Dear All, I am trying to create a ALV Tree using Class cl_gui_alv_tree. The Report Shows the Output with the first Node but when i try to expand it is dumping with a runtime error GETWA_NOT_ASSIGNED in class CL_ALV_TREE_BASE and method SET_ITEMS_FOR_COLUMN. The Reason being the data which was copied in the initial node display to mt_outtab is getting refreshed.

Can any one of you help me the reason for the table getting refreshed. Do i need to pass any data.

I am doing the following steps.

1. Create Container,

2. Create Tree Class object

3. Generate the Field Catalog.

4. Set table for first display " With empty internal table

5. Generate the Hierarchy

6. Call the Method Frontend Update.

Let me know if i had missed any steps in the process.

Thank you,

Regards,

Swaroop Patri