L4linux startup problem

Hi L4 hackers, I encountered some problems when running l4linux. I used the default configuration to run l4linux. It is good to use make qemu, but when I use make grub2iso to generate iso, use qemu-system-x86_64 -cdrom l4linux-mag.iso to run. The following error occurred mag | Hello from MAG mag | mapped frame buffer at 0x1200000 mag | ERROR: could not start screen driver for given video mode. mag | Maybe unsupported pixel format... exiting mag | MAG: destroy FB svc Ned[lua]: Warning: Capability 433000 does not support the meta protocol: -2004 lua error: rom/l4lx-gfx.cfg:52: attempt to call a nil value (method 'create'). qemu-system-x86_64: terminating on signal 2 what should i do? thanks