prior to starting this thread, and presuming (my bad) , it may be theme issue, i tried The website encountered an unexpected error. Please try again later - #8 by mstenta as per your previous post and found that the farmos started fresh installation 
now i am using it afresh without https without any issues (i started this thread to learn what i must be doing wrong to prevent future issues, i got the same reinstall once earlier also coz of the theme issue)