It often helps to pinpoint exactly where the error occurs by adding a break-point on the infolog (Class: info, method: add). The you can see the xpp stack behind it.
Number sequence is a multi table setup, some are not directly accessible through the GUI. On table in particular might be mismatching, the table for Number Sequence reference. All this might become clear when you see in the debugger how it is trying to find the numbersequence, from where and how it determines the criteria. I suspect some inconsistencies between NumberSequence tables there. The issue might also just be that parameters did not pick up on the changes you did and are not finding their way. At any rate, debugger is your best tool