Error on my website

I got a error on my website now i using this rss plugin, can somebody help me, because i can log in to my admin now.

[Sat Jan 19 20:32:06 2013] [error] [client 89.99.90.225] PHP Warning: is_readable() [function.is-readable]: open_basedir restriction in effect.

File/wp-content/plugins/wp-rss-aggregator/wp-rss-aggregator.php/lang/wprss-nl_NL.mo) is not within the allowed path(s):

http://ww.wp.xz.cn/extend/plugins/wp-rss-aggregator/