dropdownerror

          <li class="dropdown user-menu">
            <a href="#" class="dropdown-toggle" data-toggle="dropdown">
               <img style="width: 20px" src="<?=base_url().'assets/profile/'.$this->session->userdata('picture_url');?>" class="img-circle" alt="User Image">
              <span class="hidden-xs"><?=$this->session->userdata('username');?></span>
            </a>
            <ul class="dropdown-menu">
              <!-- User image -->
              <li class="user-header">
                <img style="width: 86px" src="<?=base_url().'assets/profile/'.$this->session->userdata('picture_url');?>" class="img-circle" alt="User Image">

                <p>
                  Alexander Pierce - Web Developer
                  <small>Member since Nov. 2012</small>
                </p>
              </li>
              <!-- Menu Body -->
              <li class="user-body">
                <div class="row">
                  <div class="col-xs-4 text-center">
                    <a href="#">Followers</a>
                  </div>
                  <div class="col-xs-4 text-center">
                    <a href="#">Sales</a>
                  </div>
                  <div class="col-xs-4 text-center">
                    <a href="#">Friends</a>
                  </div>
                </div>
                <!-- /.row -->
              </li>
              <!-- Menu Footer-->
              <li class="user-footer">
                <div class="pull-left">
                  <a href="#" class="btn btn-default btn-flat">Profile</a>
                </div>
                <div class="pull-right">
                  <a href="<?=base_url().'user/logout'?>" class="btn btn-default btn-flat logout">Sign out</a>
                </div>
              </li>
            </ul>
          </li>