Cross DJ won't grant me access to my external drive

I have a segate external drive and Cross DJ will not allow me access to the music on it. When i click to grant access it gives me the following message:
Can't load track: This file access is restricted (OSX-sandbox limitations), you first have to resolve access by selecting one of its parent folder.
This is very frustrating. Please help me to resolve this problem or refund my money for the app. Your forum is not helpful and it would be nice if there was some sort of human tech support
Can't load track: This file access is restricted (OSX-sandbox limitations), you first have to resolve access by selecting one of its parent folder.
This is very frustrating. Please help me to resolve this problem or refund my money for the app. Your forum is not helpful and it would be nice if there was some sort of human tech support