Exception in Starting Yahoo searching API Sample code

[srinu n]

Hi Friends,

This is the first day that i working on Yahoo search marketing API. When i started running addCompaingn.java i am getting the following Exception.

[b][debug] loading ewsconfig.properties
Exception in thread "main" java.lang.ExceptionInInitializerError
at com.yahoo.sm.ws.client.AddCampaign.initialize(AddCampaign.java:46)
at com.yahoo.sm.ws.client.AddCampaign.main(AddCampaign.java:30)
Caused by: java.lang.NullPointerException
at java.util.Properties$LineReader.readLine(Unknown Source)
at java.util.Properties.load0(Unknown Source)
at java.util.Properties.load(Unknown Source)
at com.yahoo.sm.ws.client.helper.EWSConfigurator.<init>(EWSConfigurator.java:25)
at com.yahoo.sm.ws.client.helper.EWSConfigurator.<clinit>(EWSConfigurator.java:18)
... 2 more[/b]

please advice me where the problem is.........?