Jira API error.

Hello.

I found potential bug in Jira API.

My code is
List<ChangeHistory> changes = ComponentAccessor.getChangeHistoryManager().getChangeHistories(ComponentAccessor.getIssueManager().getIssueObject("SITE-3"));
for (int i = 0; i < changes.size(); i++) {
ChangeHistory ch = changes.get;

try

{ System.out.println("Comment +++ " + ch.getComment()); }

catch (Exception e)

{ e.printStackTrace(); }

System.out.println("id " + ch.getId());
try { System.out.println("ch.getLevel +++ " + ch.getLevel()); } catch (Exception e) { e.printStackTrace(); }

}

In executing this code gets two exceptions:

on line System.out.println("Comment +++ " + ch.getComment());
exception is
INFO] [talledLocalContainer] java.lang.IllegalArgumentException: [GenericEntity.get] "body" is not a field of ChangeGroup
[INFO] [talledLocalContainer] at org.ofbiz.core.entity.GenericEntity.get(GenericEntity.java:210)
[INFO] [talledLocalContainer] at org.ofbiz.core.entity.GenericEntity.getString(GenericEntity.java:399)
[INFO] [talledLocalContainer] at com.atlassian.jira.issue.changehistory.ChangeHistory.getComment(ChangeHistory.java:154)
[INFO] [talledLocalContainer] at name.khartn.jira.lotus.wsdl.SyncIssues.execute(SyncIssues.java:111)
[INFO] [talledLocalContainer] at org.quartz.core.JobRunShell.run(JobRunShell.java:203)
[INFO] [talledLocalContainer] at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:520)

and in line System.out.println("ch.getLevel +++ " + ch.getLevel());
exception is
[INFO] [talledLocalContainer] java.lang.IllegalArgumentException: [GenericEntity.get] "level" is not a field of ChangeGroup
[INFO] [talledLocalContainer] at org.ofbiz.core.entity.GenericEntity.get(GenericEntity.java:210)
[INFO] [talledLocalContainer] at org.ofbiz.core.entity.GenericEntity.getString(GenericEntity.java:399)
[INFO] [talledLocalContainer] at com.atlassian.jira.issue.changehistory.ChangeHistory.getLevel(ChangeHistory.java:149)
[INFO] [talledLocalContainer] at name.khartn.jira.lotus.wsdl.SyncIssues.execute(SyncIssues.java:118)
[INFO] [talledLocalContainer] at org.quartz.core.JobRunShell.run(JobRunShell.java:203)
[INFO] [talledLocalContainer] at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:520)

Can you fix this issue?