collect2: ld returned 1 exit status

Ld "build/Debug-iphonesimulator/Cloudmade Map.app/Cloudmade Map" normal i386
cd /Users/MPDEV/Documents/cloudmade2
setenv MACOSX_DEPLOYMENT_TARGET 10.6
setenv PATH "/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc-4.2 -arch i386 -isysroot /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/开发者_开发知识库iPhoneSimulator4.3.sdk -L/Users/MPDEV/Documents/cloudmade2/build/Debug-iphonesimulator -L/Users/MPDEV/Documents/cloudmade2/libs/Proj4 -L/Users/MPDEV/Documents/cloudmade2/libs/CloudMade -L/Users/MPDEV/Documents/cloudmade2/libs/route-me -F/Users/MPDEV/Documents/cloudmade2/build/Debug-iphonesimulator -filelist "/Users/MPDEV/Documents/cloudmade2/build/cloudmade2.build/Debug-iphonesimulator/cloudmade2.build/Objects-normal/i386/Cloudmade Map.LinkFileList" -mmacosx-version-min=10.6 -lMapView -lProj4 -lCloudMadeApi -ObjC -all_load -Xlinker -objc_abi_version -Xlinker 2 -framework Foundation -framework UIKit -framework CoreGraphics -lsqlite3 -framework QuartzCore -lstdc++.6 -o "/Users/MPDEV/Documents/cloudmade2/build/Debug-iphonesimulator/Cloudmade Map.app/Cloudmade Map"

Undefined symbols:

  "_OBJC_CLASS_$_RMDBMapSource", referenced from:
      objc-class-ref-to-RMDBMapSource in cloudmade2ViewController.o
ld: symbol(s) not found
collect2: ld returned 1 exit status

How do i solve this problem? I tried looking around but found no answer how to solve it.

Your target does not include RMDBMapSource.m for compile sources, and probably more files. Check that your have included all files from route-me project to your target.