I installed moodle 3.10.1 on my server host and everything was ok and without any error . the day after that i logged in to my moodle site to add courses and other stuff but when I clicked on "site administration" link in the dashboard, an error occured which is:
This page isn’t working
nammdar.ir is currently unable to handle this request.
I thought that the problem may be in the installation . therefore I droped all the tables of database and deleted the database and moodle folders completely and then I installed moodle 3.10.1 again from scratch on my host and again everything was perfect without any problem or error. but again one day after that when I logged in to my moodle site to do my things, again I could not access the administration page.
Now I am so confused why this happens to my moodle site and I must resolve this problem as soon as possible for the sake of time.
I really appreciate any help or clue to resolve this problem.