com coinbase api exc eption UnauthorizedE xception

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I'm making a web application using Coinbase API. API link: https://github.com/coinbase/coinbase-java

Now i'm trying to run a simple program but i'm getting error as:

com.coinbase.api.exc­eption.UnauthorizedE­xception:
  at com.coinbase.api.Coi­nbaseImpl.doHttp(Coi­nbaseImpl.java:1191)
  at com.coinbase.api.Coi­nbaseImpl.get(Coinba­seImpl.java:1214)