PVRTexTool saveFile is wrong

PowerVR Insider
1

Hi,
When i use the method of CPVRTexture::saveFile(),there is a error of " public: static unsigned __int64 const CPVRTString::npos" (?npos@CPVRTString@@2_KB) pvr_test E:\test\pvr\pvr_test\pvr_test\pvr_test.obj
"
Please help.