First I have a Project in vc60,it uses MFC,it works well,but later I add some .c or .h files (not use MFC) into the project,when compile,it's response:

-------------------Configuration: Search - Win32 Debug--------------------
Compiling...
En.c
d:\yj\httpsource\search\src\en.c(1) : fatal error C1853: 'Debug/Search.pch' is not a precompiled header file created with this compiler
head.c
d:\yj\httpsource\search\src\head.c(1) : fatal error C1853: 'Debug/Search.pch' is not a precompiled header file created with this compiler
Hz.c
d:\yj\httpsource\search\src\hz.c(1) : fatal error C1853: 'Debug/Search.pch' is not a precompiled header file created with this compiler
inverse.c
d:\yj\httpsource\search\src\inverse.c(1) : fatal error C1853: 'Debug/Search.pch' is not a precompiled header file created with this compiler
keytab.c
d:\yj\httpsource\search\src\keytab.c(1) : fatal error C1853: 'Debug/Search.pch' is not a precompiled header file created with this compiler
std.c
d:\yj\httpsource\search\src\std.c(1) : fatal error C1853: 'Debug/Search.pch' is not a precompiled header file created with this compiler
Generating Code...
Error executing cl.exe.

Search.exe - 6 error(s), 0 warning(s)

Why? How to solve?
Please Help me!