major error on upgrade from 1.6.18 to the latest

[kentishembroidery]

Quote

[INTERNAL] /var/www/vhosts/kentishembroidery.co.uk/httpdocs/src/PrestaShopBundle/Install/LanguageList.php line 100 - Error: Class 'PrestashopInstallerException' not found #0 /var/www/vhosts/kentishembroidery.co.uk/httpdocs/admin5689vf0fn/autoupgrade/latest/install/upgrade/php/migrate_tabs_17.php(57): PrestaShopBundle\Install\LanguageList->setLanguage('gb') #1 [internal function]: migrate_tabs_17() #2 /var/www/vhosts/kentishembroidery.co.uk/httpdocs/modules/autoupgrade/classes/UpgradeTools/CoreUpgrader/CoreUpgrader.php(372): call_user_func_array('migrate_tabs_17', Array) #3 /var/www/vhosts/kentishembroidery.co.uk/httpdocs/modules/autoupgrade/classes/UpgradeTools/CoreUpgrader/CoreUpgrader.php(340): PrestaShop\Module\AutoUpgrade\UpgradeTools\CoreUpgrader\CoreUpgrader->runPhpQuery('1.7.0.0', '/* PHP:migrate_...') #4 /var/www/vhosts/kentishembroidery.co.uk/httpdocs/modules/autoupgrade/classes/UpgradeTools/CoreUpgrader/CoreUpgrader.php(264): PrestaShop\Module\AutoUpgrade\UpgradeTools\CoreUpgrader\CoreUpgrader->runQuery('1.7.0.0', '/* PHP:migrate_...') #5 /var/www/vhosts/kentishembroidery.co.uk/httpdocs/modules/autoupgrade/classes/UpgradeTools/CoreUpgrader/CoreUpgrader17.php(52): PrestaShop\Module\AutoUpgrade\UpgradeTools\CoreUpgrader\CoreUpgrader->upgradeDb('1.6.1.18') #6 /var/www/vhosts/kentishembroidery.co.uk/httpdocs/modules/autoupgrade/classes/UpgradeTools/CoreUpgrader/CoreUpgrader.php(81): PrestaShop\Module\AutoUpgrade\UpgradeTools\CoreUpgrader\CoreUpgrader17->upgradeDb('1.6.1.18') #7 /var/www/vhosts/kentishembroidery.co.uk/httpdocs/modules/autoupgrade/classes/TaskRunner/Upgrade/UpgradeDb.php(41): PrestaShop\Module\AutoUpgrade\UpgradeTools\CoreUpgrader\CoreUpgrader->doUpgrade() #8 /var/www/vhosts/kentishembroidery.co.uk/httpdocs/admin5689vf0fn/autoupgrade/ajax-upgradetab.php(52): PrestaShop\Module\AutoUpgrade\TaskRunner\Upgrade\UpgradeDb->run() #9 {main}

This is the error I got, can anyone help me please?