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When I click "Ask the Question" button, it displays the page at site.com says "A database error occurred" WHY ? How I can resolve this issue 

 

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What information in your web server error log is being recorded?
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these are the errors in the error log
[10-Jul-2015 07:42:02 America/Denver] PHP Warning:  session_start() [<a href='function.session-start'>function.session-start</a>]: Cannot send session cache limiter - headers already sent (output started at /home/isalna/public_html/qa-include/ajax/asktitle.php:76) in /home/isalna/public_html/qa-include/app/users.php on line 146
[10-Jul-2015 07:42:51 America/Denver] PHP Warning:  Invalid argument supplied for foreach() in /home/isalna/public_html/qa-include/qa-base.php(572) : eval()'d code on line 77
[10-Jul-2015 00:28:23 America/Denver] PHP Fatal error:  Cannot redeclare get_base_url() (previously declared in /home/isalna/public_html/qa-plugin/qawork/functions.php:7) in /home/isalna/public_html/qa-plugin/ra-option-panel/qa-plugin.php on line 69
[10-Jul-2015 00:28:23 America/Denver] PHP Fatal error:  Cannot redeclare get_base_url() (previously declared in /home/isalna/public_html/qa-plugin/qawork/functions.php:7) in /home/isalna/public_html/qa-plugin/ra-option-panel/qa-plugin.php on line 69
[10-Jul-2015 00:18:43 America/Denver] PHP Notice:  Trying to get property of non-object in /home/isalna/public_html/qa-theme/SnowFlat/qa-theme.php on line 309
[10-Jul-2015 00:18:43 America/Denver] PHP Notice:  Trying to get property of non-object in /home/isalna/public_html/qa-theme/SnowFlat/qa-theme.php on line 309
[06-Jul-2015 09:19:45 America/Denver] PHP Warning:  session_start() [<a href='function.session-start'>function.session-start</a>]: Cannot send session cache limiter - headers already sent (output started at /home/isalna/public_html/qa-include/ajax/asktitle.php:76) in /home/isalna/public_html/qa-include/app/users.php on line 146
[07-Jul-2015 07:12:17 America/Denver] PHP Warning:  Invalid argument supplied for foreach() in /home/isalna/public_html/qa-include/qa-base.php(572) : eval()'d code on line 77
[08-Jul-2015 16:23:43 America/Denver] PHP Warning:  mysqli::mysqli() [<a href='mysqli.mysqli'>mysqli.mysqli</a>]: (HY000/1040): Too many connections in /home/isalna/public_html/qa-include/qa-db.php on line 66

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