Reading profile /etc/firejail/default.profile
Reading profile /etc/firejail/disable-common.inc
Reading profile /etc/firejail/disable-programs.inc
Reading profile /etc/firejail/landlock-common.inc

** Note: you can use --noprofile to disable default.profile **

firejail version 0.9.80

Parent pid 63759, child pid 63760
Warning: /sbin directory link was not blacklisted
Warning: /usr/sbin directory link was not blacklisted
Base filesystem installed in 22.11 ms
Child process initialized in 56.25 ms
Running Undertale
[binfmt_dispatcher] Using FEX with muvm
Error: Failed to create lock file

Caused by:
    Permission denied (os error 13)

Parent is shutting down, bye...

./start.sh is a shell script that launches the executable, its running the script (hence the "Running Undertale") but the executable (which is x86_64) cannot be run because Firejail restrictions block the muvm/FEX lock file

how do i configure firejail to allow muvm/FEX to launch