i meet a strange error in generating exe files with a programme which runs well with source code.i search on net only to find nobody else have met this problem ever before. 
the discription of problem : 
Possible reasons: 
An error occurred while saving the following file: 
D:\Sumsang\LV Source\Supports\Camera DLL\Public\LoadImageAsPicture__cam.vi 
Invoke Node in AB_Source_VI.lvclass:Close_Reference.vi->AB_Build.lvclass:Copy_Files.vi->AB_Application.lvclass:Copy_Files.vi->AB_Build.lvclass:Build.vi->AB_EXE.lvclass:Build.vi->AB_Engine_Build.vi->AB_Build_Invoke.vi->AB_Build_Invoke.vi.ProxyCaller 
<APPEND> 
Method Name: <b>Save:Target Instrument</b> 
Detail: 
Visit the Request Support page at ni.com/ask to learn more about resolving this problem. Use the following information as a reference: 
Error 1502 occurred at AB_Source_VI.lvclass:Close_Reference.vi -> AB_Build.lvclass:Copy_Files.vi -> AB_Application.lvclass:Copy_Files.vi -> AB_Build.lvclass:Build.vi -> AB_EXE.lvclass:Build.vi -> AB_Engine_Build.vi -> AB_Build_Invoke.vi -> AB_Build_Invoke.vi.ProxyCaller 
Possible reason(s): 
LabVIEW:  Cannot save a bad VI without its block diagram.