Need support to onboard with mautic self hosted version

Your software
My Mautic version is: 3.3.2
My PHP version is: 7.3.27
My Database type and version is: MySQL, Sorry I don’t know how to check version

Your problem
My problem is:
Hello Friends, I am Sandeep Goyal. I am new to Mautic and honestly not from development background. But with the help of online videos and articles, I have added cron jobs, configured email settings etc. But When I am trying to create email in channels, As soon as i click on apply or save and close. It goes back to select template or segment option and this time does not even give option to apply or save and close or build etc.

These errors are showing in the log: don’t know how to take logs

Steps I have tried to fix the problem: no steps taken yet but if get steps them i will be able to perform it