Some erros please help.

[cheater]

Please help me. I was able to install Jumi but when I enable "system Jumi" this error appear on top of my website.

Notice: Trying to get property of non-object in /home/cheater/public_html/plugins/system/jumi/jumi.php on line 30

Notice: Trying to get property of non-object in /home/cheater/public_html/plugins/system/jumi/jumi.php on line 39

Notice: Trying to get property of non-object in /home/cheater/public_html/plugins/system/jumi/jumi.php on line 63

Notice: Trying to get property of non-object in /home/cheater/public_html/plugins/system/jumi/jumi.php on line 63

Notice: Trying to get property of non-object in /home/cheater/public_html/plugins/system/jumi/jumi.php on line 94

If you want the website its http://movieruby.com

Thanks in advance.