Exception occurred: java.lang.IllegalArgumentException: Multiple entries with same key: customfield_10004=com.atlassian.jira.rest.v2.issue.IssueBeanBuilder2$FieldData@7b896c91 and customfield_10004=com.atlassian.jira.rest.v2.issue.IssueBeanBuilder2$FieldData@670a5223
It's now very hard to do that in plain JIRA, but you've got a damaged issue in the database.
You might be able to repair it by editing the issue(s) that have many entries in customfield_10004, but I'd be more worried about how you got there - scripts? Broken addons?
It is due to Rank field I have created a KB at https://confluence.atlassian.com/display/JIRAKB/Can%27t+Create+Issue+Due+To+java.lang.IllegalArgumentException%3A+Multiple+entries+with+same+key
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