Error upgrading from 1.5.6.4 to 2.3.0.2

Hi I'm upgrading from 1.5.6.4 to 2.3.0.2 and I'm getting this error after clicking on continue to upgrade
Can anyone point me in the right direction?

SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data OK
Deprecated: mysql_connect(): The mysql extension is deprecated and will be removed in the future: use mysqli or PDO instead in /home/www/thehallacafactory.com/system/library/db/mysql.php on line 7
{"success":"Patch 1000 has been applied (1 of 9)","next":"https:\/\/www.thehallacafactory.com\/install\/index.php?route=upgrade\/upgrade\/next&step=2"}

Well, better always search the forum or Google first, this has be handled many times:
The mysql extension is deprecated
But don't expect it to work, if you don't use an untouched virgin old OC Version for this
Good Luck
Ernie