HELP - PANIC TSL 2.2

Hi all,
friday morning, just before winter holidays...2 hours ago...

my client cannot authenticate themselves on samba 

Log:

lib/util.c:smb_panic (1599)
pdb_get_methods_reload: failed to get pdb methods for backend tdbsam, smbpasswd

BACKTRACE: 3 stack frames:
0 pdbedit (smb_panic...)
1 /lib/libc.so.6....
2 pdbedit (chroot....)

i've: /core dir under log with nmbd e smbd dir and a core.2151 file...may be useful ?

i'm in a production enviroment...so...my holidays will start very later i know...

thanks all for your support

Bujo