Hello everyone, I am working one the Module Build Reusable Lightning Components in the Unit Create an Indicator Badge Apex Service, I did all the steps but when I tried to verify this step I get an error: "Challenge Not yet complete... here's what's wrong: 
There was an unexpected error in your org which is preventing this assessment check from completing: System.ListException: List index out of bounds: 0"

Since it is only two Copy / Paste the chanllange of this unit, can someone help me with this ?

 I am using leaflet library to show accounts on map.
I have able to show it but after clicking on popup of marker of location. it throws error


when I try to click on multiple markers after that if I zoom in / zoom out the map it throws the error as:
Error while searching functionality in lightening component not getting what is the issue
Try refreshing the page. If that doesn't do the trick, give your Salesforce administrator the following error ID, and describe what you were trying to accomplish.
Error ID: 1502784564
This page has an error. You might just need to refresh it. [Cannot read property '_latLngToNewLayerPoint' of null]


Can anyone help me to out of this.