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java.lang.IllegalArgumentException: Cannot encode null object	at org.scribe.utils.Preconditions.check(Preconditions.java:84)	at org.scribe.utils.Preconditions.checkNotNull(Preconditions.java:31)	at org.scribe.utils.OAuthEncoder.encode(OAuthEncoder.java:30)	at org.scribe.model.Parameter.asUrlEncodedPair(Parameter.java:23)	at org.scribe.model.ParameterList.asFormUrlEncodedString(ParameterList.java:74)	at org.scribe.model.ParameterList.asOauthBaseString(ParameterList.java:64)	at org.scribe.extractors.BaseStringExtractorImpl.getSortedAndEncodedParams(BaseStringExtractorImpl.java:36)	at org.scribe.extractors.BaseStringExtractorImpl.extract(BaseStringExtractorImpl.java:26)	at org.scribe.oauth.OAuth10aServiceImpl.getSignature(OAuth10aServiceImpl.java:150)	at org.scribe.oauth.OAuth10aServiceImpl.addOAuthParams(OAuth10aServiceImpl.java:75)	at org.scribe.oauth.OAuth10aServiceImpl.signRequest(OAuth10aServiceImpl.java:126)