appending .map to the URL

[hama...@gmail.com]

trying to load the script gives this error ..GET http://dygraphs.com/dygraph-combined.js.map 404 (Not Found) 

also tried to host the script locally and renamed it to something else .. yet the URL changes but the file name is still dygraph-combined.js.map and the error becomes ::

GET http://localhost:9080/js/app/dygraph-combined.js.map 404 (Not Found)