java.lang.ClassCastException: org.thoughtslive.jenkins.plugins.jira.api.input.FieldsInput.fixVersions expects class [Lorg.thoughtslive.jenkins.plugins.jira.api.Version; but received class org.thoughtslive.jenkins.plugins.jira.api.Version

The above exception is thrown when trying to update an existing JIRA with an fix version.
def result = jiraGetIssue site: "JIRA",  idOrKey: jiranumber
//found version is a version that is found in a search.
def jiraIssue = [fields: [fixVersions: foundVersion]]
response = jiraEditIssue idOrKey: result.data.id, issue: jiraIssue, site: "JIRA"