This error might occur when you try to use 

dw_1.SetSQLSelect 

which tries to replace a column's datatype with another datatype.  

As Roland says, you need to check whether the original datawindow's column matches with the updated [through SetSQLSelcet] datawindows columnss' data type.  

HTH

Happiness Always
BKR Sivaprakash

I think there is a datatype mismatch in your DataWindow. Probably it is expecting a number for a column but received non-numeric data.

Make sure the DataWindow is has the correct datatypes for the SQL it has.

Hi Sofhin;

  PB runtime internal error codes only go from 001 through 300. Also, their message look & feel is quite different.

   So this 999 error seems to be ADO.Net related. In fact, it seems to relate to your SQL Select failing. 

   You might want to try running your Select statement in the PB IDE's DB Painter's iSQL Pane. For this test, the DB Painter should give you more information. If not, try a different SS connection mechanism (like SNC). HTH

Regards ... Chris