Could not load Histogram data

Hello …Team;

Now i have been faced "Could not load histogram data " after completed configuration of Graylog
and agent didn’t send the log to server too.

Please kindly help me to solve . I’m newly user of Graylog .

Where exactly did you see the error message?
What’s in the logs of your Graylog and Elasticsearch nodes?
How did you set up and configure Graylog?

I found this error even though i download the ova

Error Message:
blocked by: [SERVICE_UNAVAILABLE/1/state not recovered / initialized];: cannot GET http://our_ip:9000/api/search/universal/relative?query=gl2_source_input%3A593fb75b45616c031eb1bf19&range=28800&limit=150&sort=timestamp%3Adesc (500)
Search status code:

Please kindly help me!!

Please answer all of these questions.

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