java.lang.NullPointerException: null

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java.lang.NullPointerException: null
at java.net.URLEncoder.encode(URLEncoder.java:204)
at twitter4j.HttpParameter.encode(HttpParameter.java:261)
at twitter4j.auth.OAuthAuthorization.encodeParameters(OAuthAuthorization.java:411)
at twitter4j.auth.OAuthAuthorization.encodeParameters(OAuthAuthorization.java:394)
at twitter4j.auth.OAuthAuthorization.normalizeRequestParameters(OAuthAuthorization.java:378)
at twitter4j.auth.OAuthAuthorization.generateAuthorizationHeader(OAuthAuthorization.java:225)
at twitter4j.auth.OAuthAuthorization.generateAuthorizationHeader(OAuthAuthorization.java:277)
at twitter4j.auth.OAuthAuthorization.getAuthorizationHeader(OAuthAuthorization.java:66)
at twitter4j.HttpClientImpl.setHeaders(HttpClientImpl.java:208)
at twitter4j.HttpClientImpl.handleRequest(HttpClientImpl.java:91)
at twitter4j.HttpClientBase.request(HttpClientBase.java:53)
at twitter4j.HttpClientBase.post(HttpClientBase.java:82)
at twitter4j.auth.OAuthAuthorization.getOAuthAccessToken(OAuthAuthorization.java:139)
at twitter4j.auth.OAuthAuthorization.getOAuthAccessToken(OAuthAuthorization.java:159)
at twitter4j.TwitterBaseImpl.getOAuthAccessToken(TwitterBaseImpl.java:370)
at com.website.talent.service.external.TwitterServiceImpl.storeAccessToken(TwitterServiceImpl.java:111)
at com.website.talent.rest.ExternalRestService.confirmTwitterAuth(ExternalRestService.java:65)
at com.website.talent.rest.ExternalRestService$$FastClassBySpringCGLIB$$248309c.invoke()
at com.website.talent.rest.ExternalRestService$$EnhancerBySpringCGLIB$$53497dbc.confirmTwitterAuth()
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory$1.invoke(ResourceMethodInvocationHandlerFactory.java:81)
at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(AbstractJavaResourceMethodDispatcher.java:144)
at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:161)

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