Assertion Failed when trying to log in

[iloving]

I've configured the LDAP section as described in both example 1 and example 2, but no matter what I do I get the following when I try to login, and the server just dies. I think I need something a smidge more informative in order to figure out what's wrong...

==> lcb: assert.js:93
==> lcb:   throw new assert.AssertionError({
==> lcb:
==> lcb:
==> lcb:
==> lcb:
==> lcb:
==> lcb:
==> lcb:
==> lcb:
==> lcb: ^
==> lcb: AssertionError: "" == true
==> lcb:     at new LdapAuth (/home/vagrant/lets-chat/node_modules/lets-chat-ldap/node_modules/passport-ldapauth/node_modules/ldapauth-fork/lib/ldapauth.js:84:10)
==> lcb:     at handleAuthentication (/home/vagrant/lets-chat/node_modules/lets-chat-ldap/node_modules/passport-ldapauth/lib/passport-ldapauth/strategy.js:140:10)
==> lcb:     at Strategy.authenticate (/home/vagrant/lets-chat/node_modules/lets-chat-ldap/node_modules/passport-ldapauth/lib/passport-ldapauth/strategy.js:175:33)
==> lcb:     at attempt (/home/vagrant/lets-chat/node_modules/passport/lib/middleware/authenticate.js:341:16)
==> lcb:     at authenticate (/home/vagrant/lets-chat/node_modules/passport/lib/middleware/authenticate.js:342:7)
==> lcb:     at Ldap.authenticate (/home/vagrant/lets-chat/node_modules/lets-chat-ldap/lib/auth.js:49:42)
==> lcb:     at /home/vagrant/lets-chat/app/auth/index.js:207:26
==> lcb:     at fn (/home/vagrant/lets-chat/node_modules/async/lib/async.js:641:34)
==> lcb:     at Object._onImmediate (/home/vagrant/lets-chat/node_modules/async/lib/async.js:557:34)
==> lcb:     at processImmediate [as _immediateCallback] (timers.js:354:15)
==> lcb: npm
==> lcb:
==> lcb: ERR!
==> lcb:  [email protected] start: `node app.js`
==> lcb: npm
==> lcb:
==> lcb: ERR!
==> lcb:  Exit status 8
==> lcb: npm
==> lcb:
==> lcb: ERR!
==> lcb:
==> lcb: npm
==> lcb:
==> lcb: ERR!
==> lcb:  Failed at the [email protected] start script.
==> lcb: npm
==> lcb:
==> lcb: ERR!
==> lcb:  This is most likely a problem with the lets-chat package,
==> lcb: npm
==> lcb:
==> lcb: ERR!
==> lcb:  not with npm itself.
==> lcb: npm
==> lcb:
==> lcb: ERR!
==> lcb:  Tell the author that this fails on your system:
==> lcb: npm
==> lcb:
==> lcb: ERR!
==> lcb:      node app.js
==> lcb: npm
==> lcb:
==> lcb: ERR!
==> lcb:  You can get their info via:
==> lcb: npm
==> lcb:
==> lcb: ERR!
==> lcb:      npm owner ls lets-chat
==> lcb: npm
==> lcb:
==> lcb: ERR!
==> lcb:  There is likely additional logging output above.
==> lcb: npm
==> lcb:
==> lcb: ERR!
==> lcb:
==> lcb: System
==> lcb:  Linux 3.2.0-23-generic-pae
==> lcb: npm
==> lcb:
==> lcb: ERR!
==> lcb:
==> lcb: command
==> lcb:  "/usr/bin/node" "/usr/bin/npm" "start"
==> lcb: npm
==> lcb:
==> lcb: ERR!
==> lcb:
==> lcb: cwd
==> lcb:  /home/vagrant/lets-chat
==> lcb: npm
==> lcb:
==> lcb: ERR!
==> lcb:
==> lcb: node -v
==> lcb:  v0.10.37
==> lcb: npm
==> lcb:
==> lcb: ERR! npm -v 1.4.28
==> lcb: npm ERR! code ELIFECYCLE
==> lcb: npm
==> lcb:
==> lcb: ERR!
==> lcb:
==> lcb: npm
==> lcb:
==> lcb: ERR!
==> lcb:  Additional logging details can be found in:
==> lcb: npm
==> lcb:
==> lcb: ERR!
==> lcb:      /home/vagrant/lets-chat/npm-debug.log
==> lcb: npm
==> lcb:
==> lcb: ERR!
==> lcb:
==> lcb: not ok
==> lcb:  code 0
The SSH command responded with a non-zero exit status. Vagrant
assumes that this means the command failed. The output for this command
should be in the log above. Please read the output to determine what
went wrong.

I have the following in my config:

providers: [ldap]
  ldap:
    connect_settings:
        url: ldap:/our.server:389
        bind_options:
          bindDN: "CN=Fully,OU=Qualified,DC=Bind,DC=User"
          bindCredentials: MyPass
        search:
          base: "DC=My,DC=Base"
          opts:
            scope: subtree
            filter: (sAMAccountName={{username}})
          field_mappings:
            uid: sAMAccountName
            firstName: givenName
            lastName: sn
            displayName: givenName
            email: mail