The file '/home/sys_ctbbot/actions-runner/run.sh' already exists.

System.NullReferenceException: Object reference not set to an instance of an object. at GitHub.Runner.Worker.JobRunner.CompleteJobAsync(IJobServer jobServer, IExecutionContext jobContext, AgentJobRequestMessage message, Nullable`1 taskResult) at GitHub.Runner.Worker.JobRunner.CompleteJobAsync(IRunnerService server, IExecutionContext jobContext, AgentJobRequestMessage message, Nullable`1 taskResult) at GitHub.Runner.Worker.JobRunner.RunAsync(AgentJobRequestMessage message, CancellationToken jobRequestCancellationToken) at GitHub.Runner.Worker.JobRunner.RunAsync(AgentJobRequestMessage message, CancellationToken jobRequestCancellationToken) at GitHub.Runner.Worker.Worker.RunAsync(String pipeIn, String pipeOut) at GitHub.Runner.Worker.Program.MainAsync(IHostContext context, String[] args)

The self-hosted runner: celadon-org-githubrunner4-694644f4f4-z6mzb lost communication with the server. Verify the machine is running and has a healthy network connection. Anything in your workflow that terminates the runner process, starves it for CPU/Memory, or blocks its network access can cause this error.