error starting uml backend: <nil>

[annadm99]

When running ./rbuild radxa-cm3-rpi-cm4-io, on Ubuntu 22.04, I get error starting uml backend: <nil>. I followed first image documentation.

2023/05/02 08:01:42 Formatting partition 2 |    32768, 98304, 163840, 229376, 294912, 819200, 884736
2023/05/02 08:01:42 Formatting partition 2 | 
2023/05/02 08:01:42 Formatting partition 2 | Allocating group tables: done                            
2023/05/02 08:01:42 Formatting partition 2 | Writing inode tables: done                            
2023/05/02 08:01:42 Formatting partition 2 | Creating journal (16384 blocks): done
2023/05/02 08:01:42 Formatting partition 2 | Writing superblocks and filesystem accounting information: done 
2023/05/02 08:01:42 Formatting partition 2 | 
2023/05/02 08:01:43 ==== Unpack rootfs ====
2023/05/02 08:02:04 ==== Deploying filesystem onto image ====
error starting uml backend: <nil>

[RadxaYuntian]

Are you running in a virtual machine? If so I suggest you enable nested virtualization.

[annadm99]

Thanks, that worked