FATAL_ERROR

Hi, the server apparently has trouble accessing the directory itself or files in it. Try running it with "mocp -SF" in one console and the client in another and go to the directory again. You should see the server crashing in the first console and outputting a better error message.

Hello!
I have similar problem (Archlinux 32bit, MOC 2.5.0-alpha4)

FATAL_ERROR: Can't send() int to the server.

[maroko@maroko-laptop ~]$ mocp -SF
Trying JACK...
Jan 26 02:14:07.97211: server.c:720 server_error(): ERROR: cannot create client jack server not running?
Jan 26 02:14:07.97273: server.c:565 add_event_all(): No events have been added because there are no clients.
Trying ALSA...
Jan 26 02:14:07.98979: alsa.c:260 alsa_init_mixer_channel(): Opened mixer (PCM), volume range: 0-255
Jan 26 02:14:07.98993: alsa.c:260 alsa_init_mixer_channel(): Opened mixer (Master), volume range: 0-31
Jan 26 02:14:07.99013: alsa.c:228 alsa_read_mixer_raw(): Mixer has no channels
Jan 26 02:14:07.129881: audio.c:937 print_output_capabilities(): Sound driver capabilities: channels 1 - 10000, formats: 8-bit signed, 8-bit unsigned, 16-bit signed, 16-bit unsigned, 24-bit signed (as 32-bit samples), 24-bit unsigned (as 32-bit samples) little-endian (native)
Jan 26 02:14:07.129917: audio.c:951 audio_initialize(): Disabling 24bit modes because Allow24bitOutput is set to no.
Jan 26 02:14:07.130074: softmixer.c:64 softmixer_init(): Softmixer initialized
Jan 26 02:14:07.130153: equalizer.c:444 equalizer_init(): Equalizer initialized
Build signature doesn't match environment
Jan 26 02:14:07.130566: tags_cache.c:957 tags_cache_load(): Can't open DB environment (/mnt/data/maroko/.moc/cache): DB_VERSION_MISMATCH: Database environment version mismatch
Jan 26 02:14:07.130788: server.c:1629 server_loop(): MOC server started, pid: 9525
Jan 26 02:14:07.130813: out_buf.c:66 read_thread(): entering output buffer thread
Jan 26 02:14:07.130876: tags_cache.c:552 reader_thread(): tags reader thread started
Jan 26 02:14:07.130891: tags_cache.c:574 reader_thread(): all queues empty, waiting

Then after Ctrl+C
^CJan 26 02:15:07.94639: server.c:129 sig_exit(): Got signal 2
Jan 26 02:15:07.94669: server.c:1683 server_loop(): Exiting...
Jan 26 02:15:07.94699: server.c:603 server_shutdown(): Server exiting...
Jan 26 02:15:07.94790: out_buf.c:128 read_thread(): exit
Jan 26 02:15:07.94804: out_buf.c:175 read_thread(): exiting
Jan 26 02:15:07.94865: out_buf.c:238 out_buf_destroy(): buffer destroyed
Jan 26 02:15:07.94898: player.c:335 precache_wait(): Precache thread is not running
Jan 26 02:15:07.95114: softmixer.c:273 softmixer_write_config(): Softmixer configuration written
Jan 26 02:15:07.95129: softmixer.c:73 softmixer_shutdown(): Softmixer stopped
Jan 26 02:15:07.95250: equalizer.c:413 equalizer_write_config(): Equalizer configuration written
Jan 26 02:15:07.95265: equalizer.c:454 equalizer_shutdown(): Equalizer stopped
Jan 26 02:15:07.95295: tags_cache.c:595 reader_thread(): exiting tags reader thread
Jan 26 02:15:07.95408: server.c:611 server_shutdown(): Server exited
Jan 26 02:15:07.95443: protocol.c:103 send_int(): send() failed: Bad file descriptor

Just deleted everything in ~/.moc/cache and MOC works just fine!

Well, now I remember that I also had to delete the cache :-)
If I recall it well the database engine was updated which made the old cache invalid (no backward compatibility).
pedrom169: If deleting the cache doesn't help you could you share your version/revision number?