PC Robots.txt PHP error message!!!

Hey I have question to ask. I used PC Robots.txt plugins but when I activate it, PHP error message will see in the top of my robots.txt file. Please do visit my robots.txt through: https://lessontolife.ce.ms/robots.txt and you will see this error message above of my robots.txt file and it goes like this:

“
<b>Warning</b>: file_exists() [function.file-exists]: open_basedir restriction in effect. File(/var/www/html/sitemap.xml.gz) is not within the allowed path(s): (/home/vhosts/lessontolife.ce.ms/:/tmp/:/usr/share/pear/) in <b>/home/vhosts/lessontolife.ce.ms/wp-content/plugins/pc-robotstxt/pc-robotstxt.php</b> on line <b>86</b>

<center><img src=’https://users.freewebhostingarea.com/i/freehosting.png&#8217; border=’0′ width=’88’ height=’15’ alt=’Free Web Hosting’></center>
<b>Warning</b>: file_exists() [function.file-exists]: open_basedir restriction in effect. File(/var/www/html/sitemap.xml) is not within the allowed path(s): (/home/vhosts/lessontolife.ce.ms/:/tmp/:/usr/share/pear/) in <b>/home/vhosts/lessontolife.ce.ms/wp-content/plugins/pc-robotstxt/pc-robotstxt.php</b> on line <b>88</b>

<center><img src=’https://users.freewebhostingarea.com/i/freehosting.png&#8217; border=’0′ width=’88’ height=’15’ alt=’Free Web Hosting’></center># This virtual robots.txt file was created by the PC Robots.txt WordPress plugin.
# For more info visit: https://petercoughlin.com/robotstxt-wordpress-plugin/
“

after that is my robots file:

[redacted]

can you fix this error message so that my robots.txt will be clean??? Thanks for helping… Waitning for your reply..