I am getting the following error when I try to erase a set of data from a file within a gdb. Any idea on what to do? I have done repair geometry multiple times on the input/erase datasets. I have 16GB RAM and close to a TB of free space. The dataset is approx 1.6m records. Arcmap 10 sp3. BTW how do I see the size of a dataset within a gdb?

Executing (Erase): Erase D:\SCRATCH\Projects\106\data\7_Merge.gdb\mergeall_1 D:\SCRATCH\Projects\106\data\5b_ReclassVector.gdb\Lidar_d2b d:\SCRATCH\Projects\106\data\6_Erase.gdb\srtm_m10m_e "1 Meters" Start Time: Sat Oct 15 02:53:38 2011 Reading Features... Processing Tiles... ERROR 999999: Error executing function. Invalid Topology [Negative point valence.] Failed to execute (Erase).