[Samba] tdb_open_ex

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I encountered the following problem, can anyone help me?   when i use "nmblookup -B 192.168.1.255 redmaple" on my linux box named redmaple, something like "(tdb(null)): could not open file /usr/local/samba/var/locks/unexpected.tdb. No such file or directory" is output, and the name lookup failes. my samba is 2.2.3a, IP address of redmaple is 192.168.1.5 rgds aloha