Hi Tzipi
In order to help you better, some extra information is useful:
what version of ACE are you running?
your laptop is a windows 11?
what youtube instructions did you follow?
How are you starting your node/integration server
It seems that your integration server has a faulty name (or no name).
You don't need a node to run stuff locally, standalone integration servers might even be better, they are more light weight anyway. You can follow the this guide from step 4 onward: https://www.ibm.com/docs/en/app-connect/13.0.x?topic=gsace-download-app-connect-enterprise-evaluation-edition-get-started
Hope this helps, otherwise let me know.