When save a Category Error : A technical problem with the server created an error. Try again to continue what you were doing. If the problem persists, try again later.

Solved this problem with below command line:

php bin/magento maintenance:enable; 
php bin/magento setup:upgrade; 
php bin/magento setup:static-content:deploy -f; 
php bin/magento cache:clean; 
php bin/magento maintenance:disable

if can not solve then remove category content and save it.


Any issues please email me.

Thanks,
Kuldeep singh