Error after magento upgrade

I have solved this problem by just simply doing this steps. follow steps :

Delete the "di" folder located in var directory (for 2.0 and 2.1)
Run this command and go to your project root folder command:
```
cd /yourmagentoroot/
```
If your Magento mode is developer then you don't need to run below commands just remove var/generation directory(2.0 & 2.1) or generated folder(2.2 onwards)
Then run this command
```
php bin/magento setup:di:compile
```
Then run this command (required in production mode only)
```
php bin/magento setup:static-content:deploy
```
Finally, give file/directory permissions.(If needed)

Giving full control (read/write/execute) to var and pub directory solved this issue for me.

sudo chmod -R 777 var pub

Or, you may also try running the command using sudo.

sudo php bin/magento setup:upgrade

Also, try clearing cache.

sudo rm -rf var/cache/* var/generation/*

Setup ownership again

CentOS: chown -R :apache .
Ubuntu: chown -R :www-data .

Refer this Link

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