This error means -there is a memory conflict between the bootloader and the code (bootloadable)
Please check the "Communication Component" is chosen as USBFS in the Configuration Settings of Bootloader Component.
Build the project,and then after successful build,link the .elf and .hex in bootloadable component's Dependencies section of its Configuartion settings.
Then ,try to bootload using the new hex file.
If issue persists,provide us with the project.