Unpackerr

[Flupke]

Hi
I am new here but i have several apps running in truenas scale and they are working fine
Now i want to install unpackerr thats working but when i try to configure it or open a shell i get this error message
OCI runtime exec failed: exec failed: unable to start container process: exec: "/bin/sh": stat /bin/sh: no such file or directory: unknown
command terminated with exit code 126

so i can not configure this or is there an other way to configure my radarr lidarr etc etc
Thanks for the help
REgards
Filip