In the create object relationships challenge, I created the new Contact field and set as lookup. I did not click Save & New. Consequently, when I go to create the Property field, Master/Detail is not an option. 

In the create object relationships challenge, I created the new Contact field and set as lookup. I did not click Save & New. Consequently, when I go to create the Property field, Master/Detail is not an option. 

Hi, 

I'm new to Salesforce and doing the beginner's admin Data Management Challenge. It keeps giving me an error message saying, 
Challenge Not yet complete... here's what's wrong: One of the contact records from the CSV file could not be found in the Org.​

Even though I've already uploaded the sample import data on my Dev Org without problems.

Any advice on this? Thank you!