What is this warning piling up in my error log????

Sat, 14 Nov 2015 08:07:30 +0000

[11-Nov-2015 15:41:17 UTC] PHP Warning: session_start(): open(/tmp/sess_5039877c1c9805c6be61eb0253b4958d, O_RDWR) failed: Permission denied (13) in /home/mysite/public_html/qa-include/qa-app-users.php on line 150

Error Log file store in my root directory.

Tue, 29 May 2012 13:28:00 +0000

I have got the following in the error LOG

[29-May-2012 17:38:51] PHP Notice: Undefined index: raw in /home/**********/public_html/question/qa-include/qa-app-format.php(1456) : eval()'d code on line 170
[29-May-2012 17:39:34] PHP Notice: Undefined index: raw in /home/**********/public_html/question/qa-include/qa-app-format.php(1456) : eval()'d code on line 170
[29-May-2012 17:44:31] PHP Notice: Undefined index: raw in /home/**********/public_html/question/qa-include/qa-app-format.php(1456) : eval()'d code on line 170
[29-May-2012 18:10:14] PHP Notice: Undefined index: points_per_a_voted in /home/**********/public_html/question/qa-plugin/NoahY-q2a-privileges-b8b796e/qa-priv-check.php on line 82
[29-May-2012 18:10:34] PHP Notice: Undefined index: points_per_a_voted in /home/**********/public_html/question/qa-plugin/NoahY-q2a-privileges-b8b796e/qa-priv-check.php on line 82
[29-May-2012 18:10:43] PHP Notice: Undefined index: points_per_a_voted in /home/**********/public_html/question/qa-plugin/NoahY-q2a-privileges-b8b796e/qa-priv-check.php on line 82
[29-May-2012 18:12:37] PHP Notice: Undefined index: points_per_a_voted in /home/**********/public_html/question/qa-plugin/NoahY-q2a-privileges-b8b796e/qa-priv-check.php on line 82
[29-May-2012 18:19:50] PHP Notice: Undefined index: raw in /home/**********/public_html/question/qa-include/qa-app-format.php(1456) : eval()'d code on line 170
[29-May-2012 18:29:39] PHP Notice: Undefined index: raw in /home/**********/public_html/question/qa-include/qa-app-format.php(1456) : eval()'d code on line 170
[29-May-2012 18:29:51] PHP Notice: Undefined index: raw in /home/**********/public_html/question/qa-include/qa-app-format.php(1456) : eval()'d code on line 170
[29-May-2012 18:30:04] PHP Notice: Undefined index: raw in /home/**********/public_html/question/qa-include/qa-app-format.php(1456) : eval()'d code on line 170
[29-May-2012 18:33:04] PHP Notice: Undefined index: raw in /home/**********/public_html/question/qa-include/qa-app-format.php(1456) : eval()'d code on line 170
[29-May-2012 18:40:35] PHP Notice: Undefined index: points_per_q_voted in /home/**********/public_html/question/qa-plugin/NoahY-q2a-privileges-b8b796e/qa-priv-check.php on line 79
[29-May-2012 18:40:46] PHP Notice: Undefined index: basetype in /home/**********/public_html/question/qa-plugin/NoahY-q2a-badges-29a87f0/qa-plugin.php on line 280
[29-May-2012 18:40:46] PHP Notice: Undefined index: basetype in /home/**********/public_html/question/qa-plugin/NoahY-q2a-badges-29a87f0/qa-plugin.php on line 290
[29-May-2012 18:40:46] PHP Notice: Undefined index: points_per_a_voted in /home/**********/public_html/question/qa-plugin/NoahY-q2a-privileges-b8b796e/qa-priv-check.php on line 82

How can I solve it. the ************* means the hosting folder - I have hide it.

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What is this warning piling up in my error log????

Error Log file store in my root directory.