prolém connexion mobile

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I create an application codename one. I want to connect it with the data base through json. I tetsted the service and I found ths error

Exception in thread "main" java.lang.NullPointerException
    at com.codename1.io.NetworkManager.isAPSupported(NetworkManager.java:909)
    at com.codename1.io.ConnectionRequest.<init>(ConnectionRequest.java:352)
    at Services.ChallengeService.getList(ChallengeService.java:26)
    at Services.test.main(test.java:22)
Java Result: 1

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