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Attempt to invoke virtual method 'int java.lang.String.length()' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.String.length()' on a null object reference	at libcore.net.UriCodec.encode(UriCodec.java:132)	at java.net.URLEncoder.encode(URLEncoder.java:57)	at com.microsoft.aad.adal.StringExtensions.URLFormEncode(StringExtensions.java:83)	at com.microsoft.aad.adal.Oauth2.buildRefreshTokenRequestMessage(Oauth2.java:177)	at com.microsoft.aad.adal.Oauth2.refreshToken(Oauth2.java:302)	at com.microsoft.aad.adal.AcquireTokenSilentHandler.acquireTokenWithRefreshToken(AcquireTokenSilentHandler.java:126)	at com.microsoft.aad.adal.AcquireTokenSilentHandler.acquireTokenWithCachedItem(AcquireTokenSilentHandler.java:269)	at com.microsoft.aad.adal.AcquireTokenSilentHandler.useMRRT(AcquireTokenSilentHandler.java:261)	at com.microsoft.aad.adal.AcquireTokenSilentHandler.tryMRRT(AcquireTokenSilentHandler.java:203)	at com.microsoft.aad.adal.AcquireTokenSilentHandler.tryRT(AcquireTokenSilentHandler.java:161)	at com.microsoft.aad.adal.AcquireTokenSilentHandler.getAccessToken(AcquireTokenSilentHandler.java:104)	at com.microsoft.aad.adal.AuthenticationContext.localFlow(AuthenticationContext.java:1461)	at com.microsoft.aad.adal.AuthenticationContext.acquireTokenAfterValidation(AuthenticationContext.java:1448)	at com.microsoft.aad.adal.AuthenticationContext.acquireTokenLocalCall(AuthenticationContext.java:1261)	at com.microsoft.aad.adal.AuthenticationContext.access$900(AuthenticationContext.java:73)	at com.microsoft.aad.adal.AuthenticationContext$7.run(AuthenticationContext.java:1220)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)	at java.lang.Thread.run(Thread.java:818)