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Marshall PriestMarshall Priest 

Install Apps and Packages in Your Trailhead Playground error message: Can anyone help?

This app can't be installed.
There are problems that prevent this package from being installed.
Apex Classes(classes/PostPriceChangeToSlack.cls) Missing featureInstalling this package requires the following feature and its associated permissions: Apex Classes
Apex Triggers(triggers/PushNotificationTrigger.trigger) Missing featureInstalling this package requires the following feature and its associated permissions: Apex Trigger
 
SandhyaSandhya (Salesforce Developers) 
Hi,

Do install in fresh org as there may be pre existing configuration that is done for other challenge.

Best Regards,
Sandhya