Help ! Failed convert file PDF to Word when use Cloud API

Hi all,
I try build project example GitHub - aspose-words-cloud/aspose-words-cloud-java: A Java library for communicating with the Aspose.Words Cloud API (I changed AppId & ApiKey).
When press button convert:
java.lang.NullPointerException: Attempt to invoke virtual method ‘java.lang.String’ on a null object reference
W/System.err: at
W/System.err: at com.example.asposewordscloudandroid.MainActivity$onActivityResult$

Thank and best regards !

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