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This exception has no message.
java.lang.NullPointerException: 	at net.oauth.signature.OAuthSignatureMethod.normalizeUrl(OAuthSignatureMethod.java:156)	at net.oauth.signature.OAuthSignatureMethod.getBaseString(OAuthSignatureMethod.java:149)	at net.oauth.signature.OAuthSignatureMethod.getSignature(OAuthSignatureMethod.java:76)	at net.oauth.signature.OAuthSignatureMethod.sign(OAuthSignatureMethod.java:47)	at net.oauth.OAuthMessage.sign(OAuthMessage.java:297)	at net.oauth.OAuthMessage.addRequiredParameters(OAuthMessage.java:287)