مشکل شما در تغییر ورژن Mysql از 4.7 به 5 می باشد برای حال مشکل مراحل زیر را دنبال نمائید

file: admin.content.php line 201
old: . "\n FROM , #__content AS c, #__categories AS cc, #__sections AS s"
new: . "\n FROM #__categories AS cc, #__sections AS s, #__content AS c "

simply move the content AS c to the end.

also: Line 312
old: . "\n FROM , #__content AS c, #__categories AS cc, #__sections AS s"
new: . "\n FROM #__categories AS cc, #__sections AS s, #__content AS c "
موفق باشید