Can't log in to web admin: "An error has happened during application run. See exception log ..."

[KO2076]

here is the error message 

Fatal error: Declaration of Temando\Shipping\Model\ResourceModel\Repository\OrderRepositoryInterface\Proxy::save(Temando\Shipping\Model\OrderInterface $order) must be compatible with Temando\Shipping\Model\ResourceModel\Repository\OrderRepositoryInterface::save(Temando\Shipping\Model\OrderInterface $order, Temando\Shipping\Api\Data\Order\OrderReferenceInterface $orderReference) in /home/xxxxxxxxxx/public_html/generated/code/Temando/Shipping/Model/ResourceModel/Repository/OrderRepositoryInterface/Proxy.php on line 7

[Manish Mittal]

Hello @KO2076 

Remove generated/code/* and run below command once:

php -dmemory_limit=-1 bin/magento setup:di:compile

What is your php version? 

[gelanivishal]

Hello @KO2076 .

Please give me permission at once below way 

find . -type f -exec chmod 644 {} \;
find . -type d -exec chmod 755 {} \;
find ./var -type d -exec chmod 777 {} \;
find ./generated -type d -exec chmod 777 {} \;
find ./pub/media -type d -exec chmod 777 {} \;
find ./pub/static -type d -exec chmod 777 {} \;
chmod 777 ./app/etc
chmod 644 ./app/etc/*.xml
chown -R :<web server group> .
chmod u+x bin/magento

Before give above permission, Please deploy static content by below command 

php bin/magento cache:clean
php bin/magento cache:flush
php bin/magento setup:upgrade
rm -rf pub/static/frontend/* pub/static/adminhtml/* var/cache/ var/generation/ var/page_cache/ var/view_preprocessed/ var/composer_home generated/
php -dmemory_limit=6G bin/magento setup:static-content:deploy -f
chmod -Rf 777 pub/ var/ generated/
php bin/magento cache:clean

--
If my answer is useful, please Accept as Solution & give Kudos