The error means that the script you are trying to use on the browser is having issues or not allowed, and you need to adjust the settings or load the application in another browser.
If the application is used a browser frame, then update it to the latest version. Typically, that problem is caused by Internet Explorer, and IE can be updated through the Windows Update.
Every time I am planning a route I get a window with these comments (Windows 10, translated from Danish):
There is a mistake on this page
Line: 0
Sign: 0
Mistake: Script error
Code: 0
URL: http://maps.googleapis.com/maps-api-v3/api/js/25/9/poly.js
Do you still want to run scripts on this page?
The error means that the script you are trying to use on the browser is having issues or not allowed, and you need to adjust the settings or load the application in another browser.
If the application is used a browser frame, then update it to the latest version. Typically, that problem is caused by Internet Explorer, and IE can be updated through the Windows Update.