Using Owncloud setup on AWS getting errors while creating user on ubuntu

error logs:

{“reqId”:“VDXiIzXzDzXmkgw6IydJ”,“level”:3,“time”:“2019-12-03T20:53:42+00:00”,“remoteAddr”:“110.224.41.157”,“user”:"–",“app”:“mysql.setup”,“method”:“POST”,“url”:"/inde
x.php",“message”:“Specific user creation failed: An exception occurred while executing 'CREATE USER ‘oc_Admin’@‘localhost’ IDENTIFIED BY 'PP6vwRRCKCWGnhxTIOlOL9TLDk54pe
‘’:\n\nSQLSTATE[HY000]: General error: 1819 Your password does not satisfy the current policy requirements”}
{“reqId”:“HDIE3eXkw85aRxSCBoIP”,“level”:3,“time”:“2019-12-03T20:56:42+00:00”,“remoteAddr”:“110.224.41.157”,“user”:"–",“app”:“mysql.setup”,“method”:“POST”,“url”:"/inde
x.php",“message”:“Specific user creation failed: An exception occurred while executing 'CREATE USER ‘oc_root’@‘localhost’ IDENTIFIED BY ‘CkGM6YJV8z10aDUomzhteK7m5DnApS’
':\n\nSQLSTATE[HY000]: General error: 1819 Your password does not satisfy the current policy requirements”}
{“reqId”:“UXkHgUTRRZg9lY5HhdQX”,“level”:3,“time”:“2019-12-03T21:14:19+00:00”,“remoteAddr”:“110.224.41.157”,“user”:"–",“app”:“mysql.setup”,“method”:“POST”,“url”:"/inde
x.php",“message”:“Specific user creation failed: An exception occurred while executing ‘CREATE USER ‘oc_Admin1’@‘localhost’ IDENTIFIED BY ‘BQhqeElM0YrfXdbergXV2i9Xu6cNF
5’’:\n\nSQLSTATE[HY000]: General error: 1819 Your password does not satisfy the current policy requirements”}
{“reqId”:“1q3rgR8tszy9Dxh1mzG1”,“level”:3,“time”:“2019-12-04T10:06:58+00:00”,“remoteAddr”:“110.224.41.157”,“user”:"–",“app”:“mysql.setup”,“method”:“POST”,“url”:"/inde
x.php",“message”:“Specific user creation failed: An exception occurred while executing ‘CREATE USER ‘oc_Admin1’@‘localhost’ IDENTIFIED BY ‘IDHYbgFxlGE0MN8wdZeLqNgaRciAk
S’’:\n\nSQLSTATE[HY000]: General error: 1819 Your password does not satisfy the current policy requirements”}
{“reqId”:“qGJvjqiUI7ilOmzU8UV4”,“level”:3,“time”:“2019-12-04T21:08:07+00:00”,“remoteAddr”:“110.224.41.157”,“user”:"–",“app”:“mysql.setup”,“method”:“POST”,“url”:"/inde
x.php",“message”:“Specific user creation failed: An exception occurred while executing 'CREATE USER ‘oc_lucky’@‘localhost’ IDENTIFIED BY 'HMz8AdcUrjZDx2sFSowFPUYeokdMW2
‘’:\n\nSQLSTATE[HY000]: General error: 1819 Your password does not satisfy the current policy requirements”}

{“reqId”:“cJ8nwMW34CoAoO7VT1bP”,“level”:3,“time”:“2019-12-04T21:14:36+00:00”,“remoteAddr”:“110.224.41.157”,“user”:"–",“app”:“mysql.setup”,“method”:“POST”,“url”:"/inde
x.php",“message”:“Specific user creation failed: An exception occurred while executing 'CREATE USER ‘oc_lucky’@‘localhost’ IDENTIFIED BY 'a65r4yydyMVj1vSoEFcBVSQ5Td5108
‘’:\n\nSQLSTATE[HY000]: General error: 1819 Your password does not satisfy the current policy requirements”}

error on owncloud portal is : sqlstate[hy000] [1044] access denied for user ‘oc_user’@’%’ to database owncloud.