Converting pdf to tiff the GhostScript function gsapi_init_with_args returns value - 100

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VB

Hi all i am trying to convert pdf file into tiff file using the source code(How to convert PDF to image using Ghostscript API by Lord TaGoh) which was published on this fourm.
When i am running source code and converting the pdf into tiff it showing me status as "File NOT converted! Check Args"
I debug the source code and found that:

[DllImport("gsdll32.dll", EntryPoint="gsapi_init_with_args")]
 private static extern int gsapi_init_with_args (IntPtr instance, int argc, IntPtr argv);

function returns value - 100 which is a fatal error. I googled to fix this error but i did not found any solution to fix the problem.

Please help me if any guy know the solution to fix the problem.

Thanks& Regards,
Atul Sharma