Error: misclassified graph coedge - probably geometrical problem
 

I got an error trying to create a pipeline grid inside a tank and tried to remove the pipe grid from the tank to create a hollow geometry from the pre-existing pipe grid.

In the process I got an error that reads:

Error: ACIS error 8002: misclassified graph coedge - probably geometrical problem.

Restoring the geometric model to the state before the current operation.

Does anyone have a clue on how to fix this.