Why btsync crashes?

Good time of day. Installed Debian 6.0.3. Downloaded btsync start with default settings:
{
 "device_name": "My Sync Device",
 "listening_port" : 0, // 0 - randomize port

/* storage_path dir contains auxilliary app files if no storage_path field: .sync dir created in the directory
 where binary is located. otherwise user-defined directory will be used */
// "storage_path" : "/home/user/.sync",

/* set location of pid file */
// "pid_file" : "/var/run/btsync/btsync.pid",

/* use UPnP for port mapping */
 "use_upnp" : true,

/* limits in kB/s. 0 - no limit */
 "download_limit" : 0,
 "upload_limit" : 0,

/* proxy configuration */
// "proxy_type" : "socks4", // Valid types: "socks4", "socks5", "http_connect". Any other value means no proxy
// "proxy_addr" : "192.168.1.2", // IP address of proxy server.
// "proxy_port" : 1080,
// "proxy_auth" : false, // Use authentication for proxy. Note: only username/password for socks5 (RFC 1929) is supported, and it is not really secure
// "proxy_username" : "user",
// "proxy_password" : "password",

 "webui" :
{
 "listen" : "192.168.1.150:8888" // remove field to disable WebUI

/* preset credentials. Use password or password_hash */
// ,"login" : "admin"
// ,"password" : "password"
// ,"password_hash" : "some_hash" // password hash in crypt(3) format
// ,"allow_empty_password" : false // Defaults to true
/* ssl configuration */
// ,"force_https" : true // disable http
// ,"ssl_certificate" : "/path/to/cert.pem"
// ,"ssl_private_key" : "/path/to/private.key"

/* directory_root path defines where the WebUI Folder browser starts (linux only). Default value is / */
// ,"directory_root" : "/home/user/MySharedFolders/"

/* dir_whitelist defines which directories can be shown to user or have folders added (linux only)
 relative paths are relative to directory_root setting */
// ,"dir_whitelist" : [ "/home/user/MySharedFolders/personal", "work" ]
}

/* !!! if you set shared folders in config file WebUI will be DISABLED !!!
 shared directories specified in config file override the folders previously added from WebUI. */
/*,
 "shared_folders" :
[
{
 "secret" : "MY_SECRET_1", // required field - use --generate-secret in command line to create new secret
 "dir" : "/home/user/bittorrent/sync_test", // * required field
 "use_relay_server" : false, // use relay server when direct connection fails
 "use_tracker" : false,
 "use_dht" : false,
 "search_lan" : true,
 "use_sync_trash" : true, // enable SyncArchive to store files deleted on remote devices
 "overwrite_changes" : false, // restore modified files to original version, ONLY for Read-Only folders
 "known_hosts" : // specify hosts to attempt connection without additional search
[
"192.168.1.2:44444"
]
}
]
*/

/* Advanced preferences can be added to config file. Info is available at http://sync-help.bittorrent.com */

}


Connect via the web interface, specify a folder to share, copy the key.
On another "server" running WinXP add shared folder you copied the key. And then btsync in Debian is dying.
Prompt, please, who can faced?

Found the logs in /usr/local/btsync/.sync/sync.log
The error text:

[20140303 14:48:20.649] Using IP address 192.168.1.150
[20140303 14:48:20.652] Loading config file version 1.4.110
[20140303 14:48:20.652] My PeerID: 10299B1FEB4CBF0E239545E201695018D95AD13E
[20140303 14:48:20.715] SF[0A7C]: Loaded folder /home/buhgal
[20140303 14:48:20.715] SF[0A7C]: failed to read '/usr/local/btsync/.sync//EE8F2CD14A20D7B54331BECA4AF86B676CA10A7C.availability'
[20140303 14:48:32.741] NAT-PMP: Unable to map port with NAT-PMP.
September 19th 19 at 00:01

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