Since the error reports an issue with the database schema, I recommend the following.
Run the following command to see the status of your database schema
bin/dspace database info
You will see output like the following
+----------------+-----------------------------------------------------+---------------------+---------+
| Version | Description | Installed on | State |
+----------------+-----------------------------------------------------+---------------------+---------+
| 1 | << Flyway Baseline >> | 2017-07-25 18:26:49 | Baselin |
| 1.1 | Initial DSpace 1.1 database schema | 2017-07-25 18:26:50 | Success |
| 1.2 | Upgrade to DSpace 1.2 schema | 2017-07-25 18:26:50 | Success |
| 1.3 | Upgrade to DSpace 1.3 schema | 2017-07-25 18:26:50 | Success |
| 1.3.9 | Drop constraint for DSpace 1 4 schema | 2017-07-25 18:26:50 | Success |
| 1.4 | Upgrade to DSpace 1.4 schema | 2017-07-25 18:26:50 | Success |
| 1.5 | Upgrade to DSpace 1.5 schema | 2017-07-25 18:26:51 | Success |
| 1.5.9 | Drop constraint for DSpace 1 6 schema | 2017-07-25 18:26:51 | Success |
| 1.6 | Upgrade to DSpace 1.6 schema | 2017-07-25 18:26:51 | Success |
| 1.7 | Upgrade to DSpace 1.7 schema | 2017-07-25 18:26:51 | Success |
| 1.8 | Upgrade to DSpace 1.8 schema | 2017-07-25 18:26:51 | Success |
| 3.0 | Upgrade to DSpace 3.x schema | 2017-07-25 18:26:51 | Success |
| 4.0 | Upgrade to DSpace 4.x schema | 2017-07-25 18:26:51 | Success |
| 4.9.2015.10.26 | DS-2818 registry update | 2017-07-25 18:26:51 | Success |
| 5.0.2014.08.08 | DS-1945 Helpdesk Request a Copy | 2017-07-25 18:26:51 | Success |
| 5.0.2014.09.25 | DS 1582 Metadata For All Objects drop constraint | 2017-07-25 18:26:51 | Success |
| 5.0.2014.09.26 | DS-1582 Metadata For All Objects | 2017-07-25 18:26:51 | Success |
| 5.6.2016.08.23 | DS-3097 | 2017-07-25 18:26:51 | Success |
| 5.7.2017.04.11 | DS-3563 Index metadatavalue resource type id column | 2017-07-25 18:26:51 | Success |
| 5.7.2017.05.05 | DS 3431 Add Policies for BasicWorkflow | 2017-07-25 18:26:51 | Success |
| 6.0.2015.03.06 | DS 2701 Dso Uuid Migration | 2017-07-25 18:26:51 | Success |
| 6.0.2015.03.07 | DS-2701 Hibernate migration | 2017-07-25 18:26:51 | Success |
| 6.0.2015.08.31 | DS 2701 Hibernate Workflow Migration | 2017-07-25 18:26:52 | Success |
| 6.0.2016.01.03 | DS-3024 | 2017-07-25 18:26:52 | Success |
| 6.0.2016.01.26 | DS 2188 Remove DBMS Browse Tables | 2017-07-25 18:26:52 | Success |
| 6.0.2016.02.25 | DS-3004-slow-searching-as-admin | 2017-07-25 18:26:52 | Success |
| 6.0.2016.04.01 | DS-1955 Increase embargo reason | 2017-07-25 18:26:52 | Success |
| 6.0.2016.04.04 | DS-3086-OAI-Performance-fix | 2017-07-25 18:26:52 | Success |
| 6.0.2016.04.14 | DS-3125-fix-bundle-bitstream-delete-rights | 2017-07-25 18:26:52 | Success |
| 6.0.2016.05.10 | DS-3168-fix-requestitem item id column | 2017-07-25 18:26:52 | Success |
| 6.0.2016.07.21 | DS-2775 | 2017-07-25 18:26:52 | Success |
| 6.0.2016.07.26 | DS-3277 fix handle assignment | 2017-07-25 18:26:52 | Success |
| 6.0.2016.08.23 | DS-3097 | 2017-07-25 18:26:52 | Success |
| 6.1.2017.01.03 | DS 3431 Add Policies for BasicWorkflow | 2017-07-25 18:26:52 | Success |
+----------------+-----------------------------------------------------+---------------------+---------+
If you see any items without a status of "Success" run the following
bin/dspace database repair
If you do not see that the entries include release 6.1, run the following command
bin/dspace database migrate
Hopefully this will resolve this issue.