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The error message "ConnectionFailedException: Unable to establish websocket connection" in relation to the Apache JMeter WebDriver Sampler's failure generally means that the sampler was not able to establish a websocket connection with the target website/application. This could be due to various reasons such as network connectivity issues, firewall restrictions, incorrect configuration of the sampler, etc. It is important to analyze the logs and error messages in detail to identify the root cause of the failure and take necessary action to resolve it.