Internal Server Error message anfer complete the installation of NextCloud 14.0.1 in Centos7

I need to install NextCloud in Centos7 and after follow all the steps of the installation, when I need to open it in the web browser with local ip first it doesnt open like appears in all the manual and it show me the message internal server error. Can you help me with a correct manual of installation in centos 7.5 or give some advice of what could be the problem.
Thank you.