"local" option yields error in boot script

[P5music]

2.9 tinycore
I put the "local" boot option in the syslinux.cfg file but I get these errors during the execution of boot script:
chgrp: /usr/local/tce.installed : operation not permitted
chgrp: /usr/local/tce.menu : operation not permitted
chgrp: /usr/local/tce.icons : operation not permitted
Can you help me?

[roberts]

Is the hosting partition for local formatted with a file system that can support Unix permissions?

[P5music]

I am booting from a usb card from where extensions are correctly loaded.
tce=sdb1 local=sdb1

[roberts]

What is hosting "local" ? 
Typically we see permission errors when hosted on a Windows file system that does not support permissions.

[tinypoodle]

I am booting from a usb card from where extensions are correctly loaded.
tce=sdb1 local=sdb1

Extensions could be correctly loaded from a PPR on a non-UNIX fs - as opposed to 'local' being working.

Why would you mix a PPR with 'local'?

[P5music]

I did not realize that the card (fat formatted) was not suitable to host a genuine linux filesystem folder.