这两个错误是什么原因造成的SQLSTATE[HY000]: 和SQLSTATE[42000]:

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1. SQLSTATE[HY000]: General error: 2014 Cannot execute queries while other unbuffered queries are active. Consider using PDOStatement::fetchAll(). Alternatively, if your code is only ever going to run against mysql, you may enable query buffering by setting the PDO::MYSQL_ATTR_USE_BUFFERED_QUERY attribute.
   
2. Warning: Cannot modify header information - headers already sent by (output started at /home/emushuco/public_html/Controller.php:1) in /home/emushuco/public_html/Controller.php on line 99

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这两个错误是什么原因造成的

1. SQLSTATE[42000]: Syntax error or access violation: 1172 Result consisted of more than one row
   
2. Warning: Cannot modify header information - headers already sent by (output started at /home/emushuco/public_html/Controller.php:1) in /home/emushuco/public_html/Controller.php on line 99

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