Exception in thread "main" RestClientException{statusCode=Optional.of(500) Edited

[Abraham MVE MENDZANA]

Hi, I'm trying to create an issue using jira rest API. But I have this error : 

Exception in thread "main" RestClientException{statusCode=Optional.of(500), errorCollections=[ErrorCollection{status=500, errors={}, errorMessages=[Internal server error]}]}
at com.atlassian.jira.rest.client.internal.async.DelegatingPromise.claim(DelegatingPromise.java:47)
at Myjira.createIssue(Myjira.java:78)
at Myjira.main(Myjira.java:51)
Caused by: RestClientException{statusCode=Optional.of(500), errorCollections=[ErrorCollection{status=500, errors={}, errorMessages=[Internal server error]}]}
at com.atlassian.jira.rest.client.internal.async.AbstractAsynchronousRestClient$2.apply(AbstractAsynchronousRestClient.java:176)
at com.atlassian.jira.rest.client.internal.async.AbstractAsynchronousRestClient$2.apply(AbstractAsynchronousRestClient.java:170)
at com.atlassian.httpclient.api.ResponsePromiseMapFunction.apply(ResponsePromiseMapFunction.java:67)
at com.atlassian.httpclient.api.ResponsePromiseMapFunction.apply(ResponsePromiseMapFunction.java:11)
at com.atlassian.util.concurrent.Promises$Of$3.apply(Promises.java:268)
at com.atlassian.util.concurrent.Promises$2.onSuccess(Promises.java:158)
at com.google.common.util.concurrent.Futures$7.run(Futures.java:1072)
at com.google.common.util.concurrent.MoreExecutors$SameThreadExecutorService.execute(MoreExecutors.java:253)
at com.google.common.util.concurrent.ExecutionList$RunnableExecutorPair.execute(ExecutionList.java:161)
at com.google.common.util.concurrent.ExecutionList.execute(ExecutionList.java:146)
at com.google.common.util.concurrent.AbstractFuture.done(AbstractFuture.java:235)
at com.google.common.util.concurrent.AbstractFuture.set(AbstractFuture.java:172)
at com.google.common.util.concurrent.SettableFuture.set(SettableFuture.java:53)
at com.atlassian.util.concurrent.Promises$Of$3.apply(Promises.java:268)
at com.atlassian.util.concurrent.Promises$2.onSuccess(Promises.java:158)
at com.google.common.util.concurrent.Futures$7.run(Futures.java:1072)
at com.google.common.util.concurrent.MoreExecutors$SameThreadExecutorService.execute(MoreExecutors.java:253)
at com.google.common.util.concurrent.ExecutionList$RunnableExecutorPair.execute(ExecutionList.java:161)
at com.google.common.util.concurrent.ExecutionList.execute(ExecutionList.java:146)
at com.google.common.util.concurrent.AbstractFuture.done(AbstractFuture.java:235)
at com.google.common.util.concurrent.AbstractFuture.set(AbstractFuture.java:172)
at com.google.common.util.concurrent.SettableFuture.set(SettableFuture.java:53)
at com.atlassian.httpclient.apache.httpcomponents.SettableFuturePromiseHttpPromiseAsyncClient$1$1.run(SettableFuturePromiseHttpPromiseAsyncClient.java:46)
at com.atlassian.httpclient.apache.httpcomponents.SettableFuturePromiseHttpPromiseAsyncClient$ThreadLocalDelegateRunnable$1.run(SettableFuturePromiseHttpPromiseAsyncClient.java:197)
at com.atlassian.httpclient.apache.httpcomponents.SettableFuturePromiseHttpPromiseAsyncClient.runInContext(SettableFuturePromiseHttpPromiseAsyncClient.java:90)
at com.atlassian.httpclient.apache.httpcomponents.SettableFuturePromiseHttpPromiseAsyncClient$ThreadLocalDelegateRunnable.run(SettableFuturePromiseHttpPromiseAsyncClient.java:192)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)

 This my code. The error is in the return line. 

private String createIssue(String projectKey, Long issueType, String issueSummary) {

IssueRestClient issueClient = restClient.getIssueClient();

IssueInput newIssue = new IssueInputBuilder(projectKey, issueType, issueSummary).build();

System.out.println("Values of issue " + newIssue.getFields().values().toString());

return issueClient.createIssue(newIssue).claim().getKey();
}