Executive Anvil

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An Error occurred while handling another error:
yii\web\HeadersAlreadySentException: Headers already sent in /home/elwataniaplast1/protected/vendor/yiisoft/yii2/web/Response.php on line 428. in /home/elwataniaplast1/protected/vendor/yiisoft/yii2/web/Response.php:366
Stack trace:
#0 /home/elwataniaplast1/protected/vendor/yiisoft/yii2/web/Response.php(339): yii\web\Response->sendHeaders()
#1 /home/elwataniaplast1/protected/vendor/yiisoft/yii2/web/ErrorHandler.php(136): yii\web\Response->send()
#2 /home/elwataniaplast1/protected/vendor/yiisoft/yii2/base/ErrorHandler.php(123): yii\web\ErrorHandler->renderException(Object(yii\db\Exception))
#3 /home/elwataniaplast1/protected/vendor/yiisoft/yii2/web/DbSession.php(210): yii\base\ErrorHandler->handleException(Object(yii\db\Exception))
#4 [internal function]: yii\web\DbSession->writeSession('51c6686272b5558...', '__flash|a:0:{}_...')
#5 /home/elwataniaplast1/protected/vendor/yiisoft/yii2/web/DbSession.php(154): session_write_close()
#6 [internal function]: yii\web\DbSession->close()
#7 {main}
Previous exception:
yii\base\ErrorException: PDOStatement::execute(): MySQL server has gone away in /home/elwataniaplast1/protected/vendor/yiisoft/yii2/db/Command.php:1290
Stack trace:
#0 [internal function]: yii\base\ErrorHandler->handleError(2, 'PDOStatement::e...', '/home/elwatania...', 1290, Array)
#1 /home/elwataniaplast1/protected/vendor/yiisoft/yii2/db/Command.php(1290): PDOStatement->execute()
#2 /home/elwataniaplast1/protected/vendor/yiisoft/yii2/db/Command.php(1158): yii\db\Command->internalExecute('SELECT\n    `kcu...')
#3 /home/elwataniaplast1/protected/vendor/yiisoft/yii2/db/Command.php(399): yii\db\Command->queryInternal('fetchAll', NULL)
#4 /home/elwataniaplast1/protected/vendor/yiisoft/yii2/db/mysql/Schema.php(542): yii\db\Command->queryAll()
#5 /home/elwataniaplast1/protected/vendor/yiisoft/yii2/db/mysql/Schema.php(138): yii\db\mysql\Schema->loadTableConstraints('session', 'primaryKey')
#6 /home/elwataniaplast1/protected/vendor/yiisoft/yii2/db/Schema.php(754): yii\db\mysql\Schema->loadTablePrimaryKey('session')
#7 /home/elwataniaplast1/protected/vendor/yiisoft/yii2/db/ConstraintFinderTrait.php(101): yii\db\Schema->getTableMetadata('{{%session}}', 'primaryKey', false)
#8 /home/elwataniaplast1/protected/vendor/yiisoft/yii2/db/QueryBuilder.php(574): yii\db\mysql\Schema->getTablePrimaryKey('{{%session}}')
#9 /home/elwataniaplast1/protected/vendor/yiisoft/yii2/db/QueryBuilder.php(546): yii\db\QueryBuilder->getTableUniqueColumnNames('{{%session}}', Array, '[]')
#10 /home/elwataniaplast1/protected/vendor/yiisoft/yii2/db/mysql/QueryBuilder.php(277): yii\db\QueryBuilder->prepareUpsertColumns('{{%session}}', Array, true)
#11 /home/elwataniaplast1/protected/vendor/yiisoft/yii2/db/Command.php(546): yii\db\mysql\QueryBuilder->upsert('{{%session}}', Array, true, '[<span class="s...')
#12 /home/elwataniaplast1/protected/vendor/yiisoft/yii2/web/DbSession.php(207): yii\db\Command->upsert('{{%session}}', Array)
#13 [internal function]: yii\web\DbSession->writeSession('51c6686272b5558...', '__flash|a:0:{}_...')
#14 /home/elwataniaplast1/protected/vendor/yiisoft/yii2/web/DbSession.php(154): session_write_close()
#15 [internal function]: yii\web\DbSession->close()
#16 {main}

Next yii\db\Exception: PDOStatement::execute(): MySQL server has gone away
The SQL being executed was: SELECT
    `kcu`.`CONSTRAINT_NAME` AS `name`,
    `kcu`.`COLUMN_NAME` AS `column_name`,
    `tc`.`CONSTRAINT_TYPE` AS `type`,
    CASE
        WHEN NULL IS NULL AND `kcu`.`REFERENCED_TABLE_SCHEMA` = DATABASE() THEN NULL
        ELSE `kcu`.`REFERENCED_TABLE_SCHEMA`
    END AS `foreign_table_schema`,
    `kcu`.`REFERENCED_TABLE_NAME` AS `foreign_table_name`,
    `kcu`.`REFERENCED_COLUMN_NAME` AS `foreign_column_name`,
    `rc`.`UPDATE_RULE` AS `on_update`,
    `rc`.`DELETE_RULE` AS `on_delete`,
    `kcu`.`ORDINAL_POSITION` AS `position`
FROM
    `information_schema`.`KEY_COLUMN_USAGE` AS `kcu`,
    `information_schema`.`REFERENTIAL_CONSTRAINTS` AS `rc`,
    `information_schema`.`TABLE_CONSTRAINTS` AS `tc`
WHERE
    `kcu`.`TABLE_SCHEMA` = COALESCE(NULL, DATABASE()) AND `kcu`.`CONSTRAINT_SCHEMA` = `kcu`.`TABLE_SCHEMA` AND `kcu`.`TABLE_NAME` = 'session'
    AND `rc`.`CONSTRAINT_SCHEMA` = `kcu`.`TABLE_SCHEMA` AND `rc`.`TABLE_NAME` = 'session' AND `rc`.`CONSTRAINT_NAME` = `kcu`.`CONSTRAINT_NAME`
    AND `tc`.`TABLE_SCHEMA` = `kcu`.`TABLE_SCHEMA` AND `tc`.`TABLE_NAME` = 'session' AND `tc`.`CONSTRAINT_NAME` = `kcu`.`CONSTRAINT_NAME` AND `tc`.`CONSTRAINT_TYPE` = 'FOREIGN KEY'
UNION
SELECT
    `kcu`.`CONSTRAINT_NAME` AS `name`,
    `kcu`.`COLUMN_NAME` AS `column_name`,
    `tc`.`CONSTRAINT_TYPE` AS `type`,
    NULL AS `foreign_table_schema`,
    NULL AS `foreign_table_name`,
    NULL AS `foreign_column_name`,
    NULL AS `on_update`,
    NULL AS `on_delete`,
    `kcu`.`ORDINAL_POSITION` AS `position`
FROM
    `information_schema`.`KEY_COLUMN_USAGE` AS `kcu`,
    `information_schema`.`TABLE_CONSTRAINTS` AS `tc`
WHERE
    `kcu`.`TABLE_SCHEMA` = COALESCE(NULL, DATABASE()) AND `kcu`.`TABLE_NAME` = 'session'
    AND `tc`.`TABLE_SCHEMA` = `kcu`.`TABLE_SCHEMA` AND `tc`.`TABLE_NAME` = 'session' AND `tc`.`CONSTRAINT_NAME` = `kcu`.`CONSTRAINT_NAME` AND `tc`.`CONSTRAINT_TYPE` IN ('PRIMARY KEY', 'UNIQUE')
ORDER BY `position` ASC in /home/elwataniaplast1/protected/vendor/yiisoft/yii2/db/Schema.php:674
Stack trace:
#0 /home/elwataniaplast1/protected/vendor/yiisoft/yii2/db/Command.php(1295): yii\db\Schema->convertException(Object(yii\base\ErrorException), 'SELECT\n    `kcu...')
#1 /home/elwataniaplast1/protected/vendor/yiisoft/yii2/db/Command.php(1158): yii\db\Command->internalExecute('SELECT\n    `kcu...')
#2 /home/elwataniaplast1/protected/vendor/yiisoft/yii2/db/Command.php(399): yii\db\Command->queryInternal('fetchAll', NULL)
#3 /home/elwataniaplast1/protected/vendor/yiisoft/yii2/db/mysql/Schema.php(542): yii\db\Command->queryAll()
#4 /home/elwataniaplast1/protected/vendor/yiisoft/yii2/db/mysql/Schema.php(138): yii\db\mysql\Schema->loadTableConstraints('session', 'primaryKey')
#5 /home/elwataniaplast1/protected/vendor/yiisoft/yii2/db/Schema.php(754): yii\db\mysql\Schema->loadTablePrimaryKey('session')
#6 /home/elwataniaplast1/protected/vendor/yiisoft/yii2/db/ConstraintFinderTrait.php(101): yii\db\Schema->getTableMetadata('{{%session}}', 'primaryKey', false)
#7 /home/elwataniaplast1/protected/vendor/yiisoft/yii2/db/QueryBuilder.php(574): yii\db\mysql\Schema->getTablePrimaryKey('{{%session}}')
#8 /home/elwataniaplast1/protected/vendor/yiisoft/yii2/db/QueryBuilder.php(546): yii\db\QueryBuilder->getTableUniqueColumnNames('{{%session}}', Array, '[]')
#9 /home/elwataniaplast1/protected/vendor/yiisoft/yii2/db/mysql/QueryBuilder.php(277): yii\db\QueryBuilder->prepareUpsertColumns('{{%session}}', Array, true)
#10 /home/elwataniaplast1/protected/vendor/yiisoft/yii2/db/Command.php(546): yii\db\mysql\QueryBuilder->upsert('{{%session}}', Array, true, '[<span class="s...')
#11 /home/elwataniaplast1/protected/vendor/yiisoft/yii2/web/DbSession.php(207): yii\db\Command->upsert('{{%session}}', Array)
#12 [internal function]: yii\web\DbSession->writeSession('51c6686272b5558...', '__flash|a:0:{}_...')
#13 /home/elwataniaplast1/protected/vendor/yiisoft/yii2/web/DbSession.php(154): session_write_close()
#14 [internal function]: yii\web\DbSession->close()
#15 {main}
Additional Information: