Well, this could be coming from several things. I am not sure what version you are running on here, but we fixed a CurrentRowIndex issue in the 1.6.6 release that could have something to do with this. So if you are running on a version older than 1.6.6, then the first thing to do would be to upgrade to 1.6.6.Secondly, when you run into CurrentRowIndex issues, this can come from many places within your code outside of the standard framework logic. For example, if your BO is empty, then a column is referenced....that would produce the error, as it should since there is no row available.
I hate to be a broken record here today, but I would really need much more detail in order to help you isolate your problem. But maybe some of these suggestions will point you in the right direction.