FreePBX Can Not Connect to Asterisk

Yes, Long story.

It has installed completely and no issues. Then I started to add Google Voice (Unsupported module), I’ve seen GV always show ‘disconnected’ (another ticket: FreePBX 14 unable to connect to Google Voice). Started to troubleshoot, modules update, system update, etc…after that got error of “Error(s) have occured, the following is the retrieve_conf output:
exit: 1” when ‘Apply Config’, during the time rebooted many times, and final seen error: “Unable to connect to Asterisk Manager”.

Anyway is it easy to fix or I have to go over reinstall again (It really took a lots of time, Nearly to give up)? Please advise…