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Chris Thilgen 6Chris Thilgen 6 

Error in Trailhead Example

https://developer.salesforce.com/trailhead/force_com_introduction/data_modeling/object_relationships

Creating a Master-Detail Relationship section refers to using the Review and Job Application objects, but they have not yet been created by the previous steps (either in this module or the previous modules).
SonamSonam (Salesforce Developers) 
Ah got your point, please check the following app guide - this has a chapter on the recruting app creation which will give you a better idea of app creation from scratch:
CHAPTER 2 :About the Sample Recruiting App http://www.salesforce.com/us/developer/docs/fundamentals/salesforce_creating_on_demand_apps.pdf