安装插件错误原因，高手解答

Warning: include_once(./common.php) [function.include-once]: failed to open stream: No such file or directory in D:\wwwroot\myciir\wwwroot\tp\vote_install.php on line 2
上传到目录，在浏览器中运行install.php  后提示如下错误

Warning: include_once() [function.include]: Failed opening './common.php' for inclusion (include_path='.;C:\php5\pear') in D:\wwwroot\myciir\wwwroot\tp\vote_install.php on line 2

Fatal error: Call to a member function version() on a non-object in D:\wwwroot\myciir\wwwroot\tp\vote_install.php on line 5
PHP Warning: include_once(./common.php) [function.include-once]: failed to open stream: No such file or directory in D:\wwwroot\myciir\wwwroot\tp\vote_install.php on line 2 PHP Warning: include_once() [function.include]: Failed opening './common.php' for inclusion (include_path='.;C:\php5\pear') in D:\wwwroot\myciir\wwwroot\tp\vote_install.php on line 2 PHP Fatal error: Call to a member function version() on a non-object in D:\wwwroot\myciir\wwwroot\tp\vote_install.php on line 5