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java.lang.IllegalArgumentException: duplicate key: Attachment	at com.google.common.base.Preconditions.checkArgument(Preconditions.java:115)	at com.google.common.collect.RegularImmutableMap.(RegularImmutableMap.java:72)	at com.google.common.collect.ImmutableMap$Builder.fromEntryList(ImmutableMap.java:221)	at com.google.common.collect.ImmutableMap$Builder.build(ImmutableMap.java:207)	at com.atlassian.labs.remoteapps.product.jira.webhook.IssueEventMapper.changeGroupToMap(IssueEventMapper.java:78)	at com.atlassian.labs.remoteapps.product.jira.webhook.IssueEventMapper.toMap(IssueEventMapper.java:40)	at com.atlassian.labs.remoteapps.product.jira.webhook.IssueEventMapper.toMap(IssueEventMapper.java:16)	at com.atlassian.labs.remoteapps.product.jira.webhook.JiraEventSerializerFactory.create(JiraEventSerializerFactory.java:41)