Issue mounting Samba share inside jail

[larynx]

I'm trying to mount a Samba share from a Windows machine inside of a FreeNAS jail and when I run mount_smbfs with

mount_smbfs -I 192.168.2.43 //testuser@test-pc/testshare /mnt/test-smb/

I receive this error

mount_smbfs: can not setup kernel iconv table (ISO8859-1:tolower): syserr = Operation not permitted

There doesn't seem to be an issue mounting it outside of the jail and then adding the folder to the jail via the GUI. Is it possible to mount it inside of the jail?