Why this error appears stdClass::$pic_item?

A PHP Error was encountered

    Severity: 4096

    Message: Object of class stdClass could not be converted to string

    Filename: views/index.php

    Line Number: 213

    Backtrace:

    File: C:\Program Files (x86)\EasyPHP-DevServer-14.1VC9\data\localweb\masterlinkci2\application\site\views\index.php
    Line: 213
    Function: _error_handler

    File: C:\Program Files (x86)\EasyPHP-DevServer-14.1VC9\data\localweb\masterlinkci2\application\site\controllers\Cspages.php
    Line: 32
    Function: view

    File: C:\Program Files (x86)\EasyPHP-DevServer-14.1VC9\data\localweb\masterlinkci2\index.php
    Line: 315
    Function: require_once


Line 213:       <img src="<?php echo base_url('assets1/images/slider/'.$pic_item);?>">


TABLE

galleries_pictures

1  picture_unique_id   int(11)

2  gallery_id  int(3)

3  galleries_picture_name   varchar(30)

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