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Nisha Pandey 26Nisha Pandey 26 

Issue to install package for Lightning App Builder trail

Hi Everyone,

I am doing Lightning App Builder trailhead where in the last trail i need to install one unmamanged package. 

Trail: https://trailhead.salesforce.com/en/content/learn/modules/lightning_app_builder/lightning_app_builder_custom_comps

But it's failed due to below error:
Install Contacts Today
By Trailhead

This app can't be installed.
There are problems that prevent this package from being installed.
Apex compile failureApex class AsyncParksServices: line 6, column 13: Invalid type: parksServices.byCountryResponse
Apex compile failureApex class AsyncParksServices: line 7, column 20: Variable does not exist: response
Apex compile failureApex class AsyncParksServices: line 17, column 13: Invalid type: parksServices.byCountry
Apex compile failureApex class AsyncParksServices: line 18, column 13: Variable does not exist: request_x

can anyone help me to resolve this issue.