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Error Could not find last opened browser window within the supplied timeout value appeared once

  • March 6, 2026
  • 1 reply
  • 10 views
A
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Hi everyone,

 

I have created a bot that runs an automation on Google Chrome. In the beginning, I run the command “Browser:Open”, and then proceed with the recorder.

It has run successfully at least several hundred times, and today I got the error “Could not find last opened browser window within the supplied timeout value” → in the try/catch the ErrorLineNumber correspond to the Brower:Open action. In the screenshot taken in case of error the VM desktop was “empty”, without any open window.

Before every run, there is a Window : close all command, to close all previously opened windows on the VM.

 I was unable to reproduce the error, does anyone know where it could come from ?

1 reply

Aaron.Gleason
Automation Anywhere Team
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  • Aaron.Gleason
  • Automation Anywhere Team
  • March 6, 2026

​@Augustin That is usually that the A360 browser extension has crashed in Chrome. Using a Window: Close all action is sometimes a good idea, but remember to wait a while for processes to terminate, especially if there are crashed or hung processes. 

How long? It depends on the system it’s running on, how much RAM, etc. There is no static amount of time to wait. I would say an absolute minimum of 5 seconds. Depending on the system, a safe delay could be up to a minute.

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