Hi Fanny Santamaria,
At a time only one lab can open to perform the exercise, if you would like to open another lab, make sure close the previous lab.
"Better whenever you start the lab don't open other windows until the lab completes":
A suggestion for conducting laboratory work. It advises against opening additional windows or distractions during the lab session. The implication is that focusing solely on the lab task at hand without diverting attention elsewhere will lead to better outcomes or efficiency.
We tried from our end; it's working fine for us. Kindly refer the below screenshot. Please follow the lab instructions, whatever mentioned in the right side when you launched the Lab.
If you are still facing any issue, please let us know in the comments and where you are encountering this error along with the screenshot for reference. We are glad to help you.
If the information is helpful, please Accept Answer so that it would be helpful to community members.
Thank you.