There are a few possible reasons why you might be getting the exception you mentioned:
The network request might have failed or been cancelled before the response body could be retrieved. You can check the network logs in the DevTools console to see if the request completed successfully.
There might be an issue with the DevTools connection. Make sure that the DevTools session is properly established and that the GetResponseBody command is being sent after the session is started.
There might be an issue with the GetResponseBody command itself. Make sure that you are using the correct version of the command for the version of the DevTools protocol that you are using.
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