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An internal server error while adding map in analytics studio
https://ap4.salesforce.com/analytics/wave/web/insertmap.apexp
Create a Custom Map for Analytics Charts
Work with GeoJSON and Create the Map
Challenge URL: https://trailhead.salesforce.com/projects/wave_charts_custom_map/steps/wave_charts_custom_map_geojson?trailmix_creator_id=00550000006FDjQAAW&trailmix_id=sharpen-your-analytics-edge
Sorry for this issue you are encountering.
This type of error indicates that an error has occurred that hasn't been trapped by the platform - a low-level java exception for example.
If you need to move quicker than, start removing functionality from the component to isolate where the problem occurs and see if there are any other mechanisms you can use.
If the problem continues may I suggest you please clear all the cookies and cache and log out of all accounts and log in once again which should resolve the issue.
Still, if the problem persists give a try by attempting the same in a different browser which should do the trick.
Hope this helps.
Please mark this as solved if it's resolved so that it gets removed from the unanswered queue which results in helping others who are encountering a similar issue.
Thanks,
Nagendra