TO REPRODUCE THE PROBLEM - download and import the solution archive from the list of "Related Content" links - expand Show Exercise Steps - follow steps 1-3 under Verify Your Work - Per step 4, click Weather Service in the Data Source section An error appears at the top of the page: Forecast Service: ** ** Exception occurred while mapping incoming response to .response_GET ROOT CAUSE It appears that the solution archive lacks a required bit of configuration. - In the Detailed steps for the exercise, find the heading "Configure the RainForecast REST Connector to use the simulation activity" - After importing the solution archive, check the REST connector Forecast - Note that there are no simulations configured. That is the missing bit of configuration. SOLUTION - Check out the REST connector Forecast so that you can make changes - Follow the instructions to add the simulation activity and save the rule - Repeat the steps to Verify Your Work