Freepbx problem in Apply config

I’m new to this forum, so if I posted this topic in the wrong place, please forgive me.

I’ve ran into a problem with my fresh installation of FREEPBX
I just finished installing and when I try to click in “Apply config” the following error is shown:

"Error: Did not receive valid response from server

XHR response code: 500 XHR responseText: undefined jQuery status: error"

My current linux version is Centos 6.8 and the current asterisk version(which I’ve installed before installing freepbx) is “Asterisk certified/13.13-cert2”

When I try to execute the command “amportal a r” the following error also appears:

[FATAL] retreive_conf failed to get engine information and cannot configure up a softwitch with out it. Error: ERROR-UNABLE-TO-PARSE

Can you guys help me out?

P.S: I just noticed how strange this version name is. But it’s what is shown when I type “core show version” in my Asterisk CLI.

In Settings, Advanced settings, locate the parameter “Force Asterisk Version” (you may need to enable Display Readonly Settings and Override Readonly Settings).

Okay, I’ve enabled both Display Readonly and Override Readonly Settings and located “Force Asterisk Version”.
I just pasted “Asterisk certified/13.13-cert2” there and restarted asterisk but the error in “Apply Config” is still happening.

I’m getting the feeling that this can be something related to my permissions since i cannot start asterisk properly from my “asterisk” user. Only from the root.

You are doing this the hard way. Just download the distro and be done with it.

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To completely remove the current version of asterisk and freepbx I installed I just need to delete all files related to them or do I need to follow some specific steps for it ?

I was able to completely remove both freepbx and asterisk from my server.
Now the only problem with installing this distro is that it comes as a “.iso” file.
How can I install it without having to boot it from the file? Because I already have my OS installed and I just wanted to install the freepbx and asterisk in it without having to erase the whole thing…

You can’t. That is the whole point, the OS installed with supported versions of everything you need.