I Installed a templatemonster theme. then every page is ok except main page.
so i asked templatemonster how to solve this problem. they said that the main page's error is related to the cache folder. the cache folder is "version1593465399".
if you see below link, there is cache folder. they said i need to drop server cache and magento cache.
so i deleted magento cache using below command.
php bin/magento setup:upgrade
php bin/magento index:reindex
php bin/magento cache:clean
However, i do not know how to drop server cache. Please let me know how to solve this problem. thanks.