Please help me to find out the root cause of the white display or error page when I run the comment "$ php bin/magento setup:upgrade " after deployment of each plugin.
But it will be resolved when I run the comments
php bin/magento setup:di:compile
php bin/magento setup:static-contenteploy -f
I am using OS:ubuntu 16, Magento: 2.3.4
After setup upgrade and clear CSS/JS, you need to deploy static content, i.e., from pub/static for caching.