Why is btsync crashing?

Question

Debian

Good day. Debian 6.0.3 installed. I downloaded btsync, I run it 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 */

}

I connect via the web interface, set the folder, share it, copy the key.
On another "server," running WinXP, I add a shared folder with the copied key. And then btsync in Debian dies.
Tell me, please, can anyone come across? Found
the logs along the path
/usr/local/btsync/.sync/sync.log 20140303 14:48:20.652] My PeerID: 10299B1FEB4CBF0E239545E201695018D95AD13E [20140303 14:48:20.715] SF[0A7C]: Loaded folder /home/buhgal [20140303]: local/btsync/.sync//EE8F2CD14A20D7B54331BECA4AF86B676CA10A7C.availability'
[20140303 14:48:32.741] NAT-PMP: Unable to map port with NAT-PMP.