Error in Importing Sample data

I already have Installed DreamHouse package while importing "Sample Data" this is the error " Error in Importing Sample data "  

when i tried to Submit the Challenge this is Error " 

We can't find the Broker custom object. Make sure you've successfully imported the DreamHouse sample data." my Org  have the Broker Custom Object Present

When i try to Uninstall this package ==Screenshot== 

Moreover i have tried to switch between the Developer Org and Trailhead Playground Org,  

==  1. 

Learn Essential Software Development Skills for Admin

2. 

SOQL for Admins

3. 

Create Relationship Queries with Custom Objects ========

#Trailhead Challenges