Error(s) in re-building vignettes:
--- re-building 'h2o_automl.Rmd' using rmarkdown
Quitting from lines 115-117 (h2o_automl.Rmd) 
Error: processing vignette 'h2o_automl.Rmd' failed with diagnostics:
H2O connection has been severed. Cannot connect to instance at http://localhost:54321/
Recv failure: Connection was reset
--- failed re-building 'h2o_automl.Rmd'

SUMMARY: processing the following file failed:
  'h2o_automl.Rmd'

Error: Vignette re-building failed.
Execution halted
Error in .h2o.__checkConnectionHealth() : 
  H2O connection has been severed. Cannot connect to instance at http://localhost:54321/
Failed to connect to localhost port 54321: Connection refused
Calls: <Anonymous> -> .h2o.__remoteSend -> .h2o.__checkConnectionHealth
Error in .h2o.__checkConnectionHealth() : 
  H2O connection has been severed. Cannot connect to instance at http://localhost:54321/
Failed to connect to localhost port 54321: Connection refused
Calls: <Anonymous> -> .h2o.__remoteSend -> .h2o.__checkConnectionHealth
Error in .h2o.__checkConnectionHealth() : 
  H2O connection has been severed. Cannot connect to instance at http://localhost:54321/
Failed to connect to localhost port 54321: Connection refused
Calls: <Anonymous> -> .h2o.__remoteSend -> .h2o.__checkConnectionHealth
Error in .h2o.__checkConnectionHealth() : 
  H2O connection has been severed. Cannot connect to instance at http://localhost:54321/
Failed to connect to localhost port 54321: Connection refused
Calls: <Anonymous> -> .h2o.__remoteSend -> .h2o.__checkConnectionHealth
Error in .h2o.__checkConnectionHealth() : 
  H2O connection has been severed. Cannot connect to instance at http://localhost:54321/
Failed to connect to localhost port 54321: Connection refused
Calls: <Anonymous> -> .h2o.__remoteSend -> .h2o.__checkConnectionHealth
Error in .h2o.__checkConnectionHealth() : 
  H2O connection has been severed. Cannot connect to instance at http://localhost:54321/
Failed to connect to localhost port 54321: Connection refused
Calls: <Anonymous> -> .h2o.__remoteSend -> .h2o.__checkConnectionHealth
Error in .h2o.__checkConnectionHealth() : 
  H2O connection has been severed. Cannot connect to instance at http://localhost:54321/
Failed to connect to localhost port 54321: Connection refused
Calls: <Anonymous> -> .h2o.__remoteSend -> .h2o.__checkConnectionHealth
Error in .h2o.__checkConnectionHealth() : 
  H2O connection has been severed. Cannot connect to instance at http://localhost:54321/
Failed to connect to localhost port 54321: Connection refused
Calls: <Anonymous> -> .h2o.__remoteSend -> .h2o.__checkConnectionHealth
Error in .h2o.__checkConnectionHealth() : 
  H2O connection has been severed. Cannot connect to instance at http://localhost:54321/
Failed to connect to localhost port 54321: Connection refused
Calls: <Anonymous> -> .h2o.__remoteSend -> .h2o.__checkConnectionHealth