Problems testing iPad app on device

I'm writting an iPad app and having problems testing it on a device. It runs fine in the simulator but as soon as I select to run on a device I get this error:

CodeSign build/Debug-iphoneos/DrivingInstructorAids.app cd /Users/tanderson/Documents/DrivingInstructorAids setenv PATH "/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin" setenv _CODESIGN_ALLOCATE_ /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/codesign_allocate /usr/bin/codesign -f -s "iPhone Developer: Matt Saunders (F56A93HGSV)" --resource-rules=/Users/tanderson/Documents/DrivingIn开发者_开发知识库structorAids/build/Debug-iphoneos/DrivingInstructorAids.app/ResourceRules.plist --entitlements /Users/tanderson/Documents/DrivingInstructorAids/build/DrivingInstructorAids.build/Debug-iphoneos/DrivingInstructorAids.build/DrivingInstructorAids.xcent /Users/tanderson/Documents/DrivingInstructorAids/build/Debug-iphoneos/DrivingInstructorAids.app /Users/tanderson/Documents/DrivingInstructorAids/build/Debug-iphoneos/DrivingInstructorAids.app: The operation was cancelled by the user. Command /usr/bin/codesign failed with exit code 1Command /usr/bin/codesign failed with exit code 1

I've managed to install a provisioning profile with a certificate for the device by following the apple provisioning assistant. I'm not sure if its 100% correct as the whole process is extremely confusing and I'm a beginner with developing on Macs.

Could anyone give me a few pointers about what the problem might be and what to do about it?

Thanks.

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There are a number of existing questions which could help you - /usr/bin/codesign failed with exit code 1 and Command /usr/bin/codesign failed with exit code 1