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An Error occurred while handling another error:
yii\web\HeadersAlreadySentException: Headers already sent in /app/vendor/yiisoft/yii2/web/Response.php on line 433. in /app/vendor/yiisoft/yii2/web/Response.php:368
Stack trace:
#0 /app/vendor/yiisoft/yii2/web/Response.php(341): yii\web\Response->sendHeaders()
#1 /app/vendor/yiisoft/yii2/web/ErrorHandler.php(136): yii\web\Response->send()
#2 /app/vendor/yiisoft/yii2/base/ErrorHandler.php(152): yii\web\ErrorHandler->renderException(Object(yii\db\Exception))
#3 /app/vendor/yiisoft/yii2/web/DbSession.php(225): yii\base\ErrorHandler->handleException(Object(yii\db\Exception))
#4 [internal function]: yii\web\DbSession->writeSession('63bb3af28868be3...', '__flash|a:0:{}')
#5 /app/vendor/yiisoft/yii2/web/DbSession.php(166): session_write_close()
#6 [internal function]: yii\web\DbSession->close()
#7 {main}
Previous exception:
PDOException: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away in /app/vendor/yiisoft/yii2/db/Command.php:1302
Stack trace:
#0 /app/vendor/yiisoft/yii2/db/Command.php(1302): PDOStatement->execute()
#1 /app/vendor/yiisoft/yii2/db/Command.php(1168): yii\db\Command->internalExecute('SHOW FULL COLUM...')
#2 /app/vendor/yiisoft/yii2/db/Command.php(410): yii\db\Command->queryInternal('fetchAll', NULL)
#3 /app/vendor/yiisoft/yii2/db/mysql/Schema.php(320): yii\db\Command->queryAll()
#4 /app/vendor/yiisoft/yii2/db/mysql/Schema.php(125): yii\db\mysql\Schema->findColumns(Object(yii\db\TableSchema))
#5 /app/vendor/yiisoft/yii2/db/Schema.php(756): yii\db\mysql\Schema->loadTableSchema('session')
#6 /app/vendor/yiisoft/yii2/db/Schema.php(192): yii\db\Schema->getTableMetadata('{{%session}}', 'schema', false)
#7 /app/vendor/yiisoft/yii2/db/QueryBuilder.php(370): yii\db\Schema->getTableSchema('{{%session}}')
#8 /app/vendor/yiisoft/yii2/db/mysql/QueryBuilder.php(258): yii\db\QueryBuilder->prepareInsertValues('{{%session}}', Array, Array)
#9 /app/vendor/yiisoft/yii2/db/QueryBuilder.php(350): yii\db\mysql\QueryBuilder->prepareInsertValues('{{%session}}', Array, Array)
#10 /app/vendor/yiisoft/yii2/db/mysql/QueryBuilder.php(278): yii\db\QueryBuilder->insert('{{%session}}', Array, Array)
#11 /app/vendor/yiisoft/yii2/db/Command.php(557): yii\db\mysql\QueryBuilder->upsert('{{%session}}', Array, true, Array)
#12 /app/vendor/yiisoft/yii2/web/DbSession.php(222): yii\db\Command->upsert('{{%session}}', Array)
#13 [internal function]: yii\web\DbSession->writeSession('63bb3af28868be3...', '__flash|a:0:{}')
#14 /app/vendor/yiisoft/yii2/web/DbSession.php(166): session_write_close()
#15 [internal function]: yii\web\DbSession->close()
#16 {main}

Next yii\db\Exception: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away
The SQL being executed was: SHOW FULL COLUMNS FROM `session` in /app/vendor/yiisoft/yii2/db/Schema.php:676
Stack trace:
#0 /app/vendor/yiisoft/yii2/db/Command.php(1307): yii\db\Schema->convertException(Object(PDOException), 'SHOW FULL COLUM...')
#1 /app/vendor/yiisoft/yii2/db/Command.php(1168): yii\db\Command->internalExecute('SHOW FULL COLUM...')
#2 /app/vendor/yiisoft/yii2/db/Command.php(410): yii\db\Command->queryInternal('fetchAll', NULL)
#3 /app/vendor/yiisoft/yii2/db/mysql/Schema.php(320): yii\db\Command->queryAll()
#4 /app/vendor/yiisoft/yii2/db/mysql/Schema.php(125): yii\db\mysql\Schema->findColumns(Object(yii\db\TableSchema))
#5 /app/vendor/yiisoft/yii2/db/Schema.php(756): yii\db\mysql\Schema->loadTableSchema('session')
#6 /app/vendor/yiisoft/yii2/db/Schema.php(192): yii\db\Schema->getTableMetadata('{{%session}}', 'schema', false)
#7 /app/vendor/yiisoft/yii2/db/QueryBuilder.php(370): yii\db\Schema->getTableSchema('{{%session}}')
#8 /app/vendor/yiisoft/yii2/db/mysql/QueryBuilder.php(258): yii\db\QueryBuilder->prepareInsertValues('{{%session}}', Array, Array)
#9 /app/vendor/yiisoft/yii2/db/QueryBuilder.php(350): yii\db\mysql\QueryBuilder->prepareInsertValues('{{%session}}', Array, Array)
#10 /app/vendor/yiisoft/yii2/db/mysql/QueryBuilder.php(278): yii\db\QueryBuilder->insert('{{%session}}', Array, Array)
#11 /app/vendor/yiisoft/yii2/db/Command.php(557): yii\db\mysql\QueryBuilder->upsert('{{%session}}', Array, true, Array)
#12 /app/vendor/yiisoft/yii2/web/DbSession.php(222): yii\db\Command->upsert('{{%session}}', Array)
#13 [internal function]: yii\web\DbSession->writeSession('63bb3af28868be3...', '__flash|a:0:{}')
#14 /app/vendor/yiisoft/yii2/web/DbSession.php(166): session_write_close()
#15 [internal function]: yii\web\DbSession->close()
#16 {main}
Additional Information:
Array
(
    [0] => HY000
    [1] => 2006
    [2] => MySQL server has gone away
)