Not understanding this Build Log [SOLVED]

[Bevo]

Well, I'd have to say that I just don't understand what is happening in this build log:

-------------- Build: Debug in Consignment List Updater ---------------
Precompiling header: options_class.h
In file included from options_class.h:5:
../Consignment List Updater/convertToNum.h: In function `double convertToNum(std::string)':
../Consignment List Updater/convertToNum.h:20: warning: comparison between signed and unsigned integer expressions
Compiling: main.cpp
In file included from ../Consignment List Updater/options_class.h:5,
                 from main.cpp:8:
../Consignment List Updater/convertToNum.h: In function `double convertToNum(std::string)':
../Consignment List Updater/convertToNum.h:20: warning: comparison between signed and unsigned integer expressions
Linking console executable: bin\Debug\Consignor.exe
options_class.h.gch: file not recognized: File format not recognized
collect2: ld returned 1 exit status
Process terminated with status 1 (0 minutes, 2 seconds)
0 errors, 2 warnings
 

Why is this not able to recognize the .gch file?  Any ideas on what can cause this?  Request more information if you need it because I don't know what that is at all.  The only thing in options_class.h is a class I have designed.  Thankyou in advance for looking at this.

[mandrav]

Make sure that options_class.h has its "compile" and "link" flags cleared (right-click on the file in the tree and click "Properties").
And also remove (delete) any *.gch file you find.

[Bevo]

Hey thanks a bunch, that helped.