Ghostscript (gswin32c. Exe) to convert PDF files into TIFF image error！How to Use？

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C++

Windows

VS2010

PDF

graphics

I am using Ghostscript (gswin3c. Exe) have this error, how do I solve?

**** Warning: can't process font stream, loading font by the name.
Can't find CID font "HYa4gj".
Attempting to substitute CID font /Adobe-Identity for /HYa4gj, see doc/Use.htm#CIDFontSubstitution.
The substitute CID font "Adobe-Identity" is not provided either. attempting to use fallback CIDFont.See doc/Use.htm#CIDFontSubstitution.
**** Warning: can't process font stream, loading font by the name.
Loading a TT font from %rom%Resource/CIDFSubst/DroidSansFallback.ttf to emulate a CID font Adobe-Identity ... Done.
Can't find CID font "HYk1gj".
Attempting to substitute CID font /Adobe-Identity for /HYk1gj, see doc/Use.htm#CIDFontSubstitution.
**** Warning: can't process font stream, loading font by the name.
Can't find CID font "HYb8gj".
Attempting to substitute CID font /Adobe-Identity for /HYb8gj, see doc/Use.htm#CIDFontSubstitution.

**** This file had errors that were repaired or ignored.
**** The file was produced by:
**** >>>> Adobe PDF Library 8.0 <<<<
**** Please notify the author of the software that produced this
**** file that it does not conform to Adobe's published PDF
**** specification.