Hi, I added SQLite functions to my project, and it works on my desktop. However, when I tried it on 2 PDA (one PC2003, and the other WM6.1 Pro), there was an error message like: 'File or assembly name' 'System.Data.SQLite, Version=220.127.116.11, Culture=neutral, PublicKeyToken=1FDB50B62B4C84', or one of its dependencies, was not found. In both cases, I had compiled 2 sets of program, one with Optimised compilation; and the other none. Both are compiled using v6.50. I also included the System.Data.SQLite.dll as well as the SQLDevice.dll (just in case). what could be the cause of the error? The program works fine without SQLite functions.