[android-developers] Hierarchical Parent error

when I try to create a new project, while creating the project there is a requied text field "hierarachical parent" I which i dont know which to put. it gives a red cross if i dont know any thing but if i give any thing the red cross disappears but when the project is get created the R.java file doesnt create. I think the hierarchical parent required some special characters. plz tell me whats the problem?

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