LUFA libraries

Hi everyong
I am tyring to program the LUFA serial-usb to the mega16U2. I cant get it to compile and burn (I dont want to use the DFU bootloader, I have an ISP MK II)
These are my errors. any ideas how to fix them:

../LUFA-120730/Projects/USBtoSerial/../../LUFA/Drivers/USB/Core/AVR8/USBController_AVR8.h: In function 'USB_PLL_On': 
../LUFA-120730/Projects/USBtoSerial/../../LUFA/Drivers/USB/Core/AVR8/USBController_AVR8.h:334: error: 'USB_PLL_PSC' undeclared (first use in this function) 
../LUFA-120730/Projects/USBtoSerial/../../LUFA/Drivers/USB/Core/AVR8/USBController_AVR8.h:334: error: (Each undeclared identifier is reported only once 
../LUFA-120730/Projects/USBtoSerial/../../LUFA/Drivers/USB/Core/AVR8/USBController_AVR8.h:334: error: for each function it appears in.) 
In file included from ../LUFA-120730/Projects/USBtoSerial/Descriptors.c:38: 
../LUFA-120730/Projects/USBtoSerial/Descriptors.h: At top level: 
../LUFA-120730/Projects/USBtoSerial/Descriptors.h:83: error: conflicting types for 'CALLBACK_USB_GetDescriptor' 
../LUFA-120730/Projects/USBtoSerial/../../LUFA/Drivers/USB/Core/AVR8/../Device.h:133: error: previous declaration of 'CALLBACK_USB_GetDescriptor' was here 
../LUFA-120730/Projects/USBtoSerial/Descriptors.c:55: error: 'FIXED_CONTROL_ENDPOINT_SIZE' undeclared here (not in a function) 
../LUFA-120730/Projects/USBtoSerial/Descriptors.c:65: error: 'FIXED_NUM_CONFIGURATIONS' undeclared here (not in a function) 
../LUFA-120730/Projects/USBtoSerial/Descriptors.c:217: error: conflicting types for 'CALLBACK_USB_GetDescriptor' 
../LUFA-120730/Projects/USBtoSerial/../../LUFA/Drivers/USB/Core/AVR8/../Device.h:133: error: previous declaration of 'CALLBACK_USB_GetDescriptor' was here

Thanks
Alex