Every time I try to add two custom wall sweeps to a wall I get the "A serious error has occured. The current action has been cancelled, etc etc"

Is this a bug within revit as I have tried mutliple methods including a standard out of the box revit wall which does contain two wall sweeps (ps I mean in its structure build-up as opposed to adding a sweep on manually through Wall>wall sweep function), and amending this to have my profiles?

I have added the two profiles individually and they work fine. Anyone else experienced this problem?

Thanks

Lee