为什么GUIBuilder工具的Image控件加载gif图片时编译正常，加载png图片编译就出错？

编译错误信息如下：
Build target 'Template'
compiling WindowDLG.c...
linking...
..OBJTemplate.axf: Error: L6218E: Undefined symbol IMAGE_SetPNG (referred from windowdlg.o).
Not enough information to list image symbols.
Finished: 1 information, 0 warning and 1 error messages.
"..OBJTemplate.axf" - 1 Error(s), 0 Warning(s).
Target not created
请教各位，谢谢！