keep getting throw error in console..

The workspace appeared to be set up for use as a server with the Workspace Preview button. But now that you said you are working with node.js, the issue is from running node at the root level, but the program is located in the "js" directory. Start it this way instead (after fixing the space of course):

node js/promises-breakfast.js

I didn't see the error you mentioned when I tried your snapshot, but I noticed how the data for one person was not available. If that's the same issue, it's because for that person (Sergey Korsakov) you get a disambiguation page instead of the info page the code is expecting. This is because there are two people with similar names in the database.

Adding code to detect and resolve a disambiguation page in a generic way would be a rather advanced challenge. But as a quick fix, you could just check for "Sergey Korsakov" and substitute "Sergey Korsakov (cosmonaut)":

btn.addEventListener('click', () => {
    getJSON(astrosUrl,(json) => {
    json.people.map( person => {
        if (person.name == "Sergey Korsakov")  // change ambiguous name to specific one
            getJSON(wikiUrl + "Sergey Korsakov (cosmonaut)", generateHTML);
        else
            getJSON(wikiUrl + person.name, generateHTML);
    });
});

I'm still not sure what steps to take to see this error (or what you mean by "run it on the command"), but just looking at the file I notice a stray space that is preventing the arrow operator from being recognised:

setTimeout(() = > {   // operator must be =>
//             ^
//             stray space