Hi, Can you help me with this,

To easily organize and access your important contacts, create a Lightning App using Lightning App Builder that uses a custom component.

• The Lightning App must be called 'MyData' and must use the One Column template. Note: If you have completed the previous challenge in this module ('Creating an App Home Lightning Page'), the app should already exist in your Developer Edition.
• Install this unmanaged package into your Developer Edition.
• Add the 'ContactsToday' custom component that is included in that package to the 'MyData' Lightning App.

Check Challenge

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I am facing this problem

Install ContactsToday Component

By salesforce.com

This app can't be installed.

There are problems that prevent this package from being installed.

oppcondition.null()line 1, column 1: Dependent class is invalid and needs recompilation: statusupdate: line 13, column 36: Invalid initial type List<Account> for Map<Id,Account> null

Challenge Not yet complete... here's what's wrong: 

The 'MyData' Lightning App does not include the 'Contacts for Today' custom component.

Regards

Pratyush