织梦提示Fatal error: Call to a member function GetInnerText

Fatal error: Call to a member function GetInnerText() on a non-object in E:\www\include\taglib\channel\img.lib.php on line 51

//遍历图片信息
$mrow = 0;
$mcol = 0;
$images = array();
$innerTmp = $arcTag->GetInnerText();
if(trim($innerTmp)=='')
{
$innerTmp = GetSysTemplets("channel_article_image.htm");
}

$innerTmp = $arcTag->GetInnerText();

$innerTmp = ($arcTag=="") ? trim($arcTag) : trim($arcTag->GetInnerText());