I have upgraded from OJS 3.1.1-4 to 3.1.2-1. The website is working good. All pages are loading properly EXCEPT settings–>Journal.
Gives the error message " DB Error: MySQL server has gone away"

Please see the error log below:
[Tue Oct 22 19:46:29.971881 2019] [lsapi:notice] [pid 743265:tid 140141611931392] [client 14.1.226.218:53079] [host www.scigreen.com] Backend log: PHP Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; ADODB_Cache_File has a deprecated constructor in /home/indianfo/domains/scigreen.com/public_html/lib/pkp/lib/adodb/adodb.inc.php on line 263\n, referer: http://www.scigreen.com/index.php/JBPT/management/settings/website
[Tue Oct 22 19:46:29.972693 2019] [lsapi:notice] [pid 743265:tid 140141611931392] [client 14.1.226.218:53079] [host www.scigreen.com] Backend log: PHP Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; ADOConnection has a deprecated constructor in /home/indianfo/domains/scigreen.com/public_html/lib/pkp/lib/adodb/adodb.inc.php on line 359\n, referer: http://www.scigreen.com/index.php/JBPT/management/settings/website
[Tue Oct 22 19:46:29.973035 2019] [lsapi:notice] [pid 743265:tid 140141611931392] [client 14.1.226.218:53079] [host www.scigreen.com] Backend log: PHP Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; ADORecordSet has a deprecated constructor in /home/indianfo/domains/scigreen.com/public_html/lib/pkp/lib/adodb/adodb.inc.php on line 2921\n, referer: http://www.scigreen.com/index.php/JBPT/management/settings/website
[Tue Oct 22 19:46:29.973082 2019] [lsapi:notice] [pid 743265:tid 140141611931392] [client 14.1.226.218:53079] [host www.scigreen.com] Backend log: PHP Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; ADORecordSet_array has a deprecated constructor in /home/indianfo/domains/scigreen.com/public_html/lib/pkp/lib/adodb/adodb.inc.php on line 3939\n, referer: http://www.scigreen.com/index.php/JBPT/management/settings/website
[Tue Oct 22 19:46:29.981185 2019] [lsapi:notice] [pid 743265:tid 140141611931392] [client 14.1.226.218:53079] [host www.scigreen.com] Backend log: PHP Deprecated: The each() function is deprecated. This message will be suppressed on further calls in /home/indianfo/domains/scigreen.com/public_html/lib/pkp/lib/adodb/adodb.inc.php on line 1003\n, referer: http://www.scigreen.com/index.php/JBPT/management/settings/website
[Tue Oct 22 19:46:30.021781 2019] [lsapi:notice] [pid 743265:tid 140141611931392] [client 14.1.226.218:53079] [host www.scigreen.com] Backend log: PHP Warning: Declaration of CustomBlockPlugin::getBlockContext() should be compatible with BlockPlugin::getBlockContext($contextId = NULL) in /home/indianfo/domains/scigreen.com/public_html/plugins/generic/customBlockManager/CustomBlockPlugin.inc.php on line 134\n, referer: http://www.scigreen.com/index.php/JBPT/management/settings/website
[Tue Oct 22 19:47:30.434817 2019] [lsapi:notice] [pid 743265:tid 140141611931392] [client 14.1.226.218:53079] [host www.scigreen.com] Backend log: PHP Warning: fsockopen(): unable to connect to pkp.sfu.ca:80 (Connection timed out) in /home/indianfo/domains/scigreen.com/public_html/lib/pkp/classes/file/wrappers/HTTPFileWrapper.inc.php on line 77\n, referer: http://www.scigreen.com/index.php/JBPT/management/settings/website
[Tue Oct 22 19:47:30.434908 2019] [lsapi:notice] [pid 743265:tid 140141611931392] [client 14.1.226.218:53079] [host www.scigreen.com] Backend log: ojs2: DB Error: MySQL server has gone away\n, referer: http://www.scigreen.com/index.php/JBPT/management/settings/website
[Tue Oct 22 19:47:30.435059 2019] [lsapi:notice] [pid 743265:tid 140141611931392] [client 14.1.226.218:53079] [host www.scigreen.com] Backend log: ojs2: DB Error: MySQL server has gone away\n, referer: http://www.scigreen.com/index.php/JBPT/management/settings/website
[Tue Oct 22 19:47:30.435190 2019] [lsapi:notice] [pid 743265:tid 140141611931392] [client 14.1.226.218:53079] [host www.scigreen.com] Backend log: PHP Warning: Unknown: Cannot call session save handler in a recursive manner in Unknown on line 0\n, referer: http://www.scigreen.com/index.php/JBPT/management/settings/website
[Tue Oct 22 19:47:30.435203 2019] [lsapi:notice] [pid 743265:tid 140141611931392] [client 14.1.226.218:53079] [host www.scigreen.com] Backend log: PHP Warning: Unknown: Failed to write session data using user defined save handler. (session.save_path: /opt/alt/php72/var/lib/php/session) in Unknown on line 0\n, referer: http://www.scigreen.com/index.php/JBPT/management/settings/website
Kindly help. Any solutions? Thanks in advance.