failed to load source map sockjs.min.js.map

[spitzlbergerj]

Hi,
I installed the module and have been trying to get it to work ever since. The module is displayed, but all values are N/A.

In the Browser Console I get the following error:

DevTools failed to load source map: Could not load content for http://192.168.178.138:8080/modules/octomirror-module/sockjs.min.js.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE

How can I fix this?
Thanks
Josef