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java.lang.NullPointerException: 	at org.apache.commons.httpclient.HttpMethodBase.setRequestHeader(HttpMethodBase.java:512)	at org.mozilla.zest.impl.ZestBasicRunner.send(ZestBasicRunner.java:487)	at org.mozilla.zest.impl.ZestBasicRunner.send(ZestBasicRunner.java:365)	at org.mozilla.zest.impl.ZestBasicRunner.runStatement(ZestBasicRunner.java:170)	at org.zaproxy.zap.extension.zest.ZestZapRunner.runStatement(ZestZapRunner.java:254)	at org.mozilla.zest.impl.ZestBasicRunner.run(ZestBasicRunner.java:142)	at org.zaproxy.zap.extension.zest.ZestZapRunner.run(ZestZapRunner.java:141)	at org.mozilla.zest.impl.ZestBasicRunner.run(ZestBasicRunner.java:98)	at org.zaproxy.zap.extension.zest.ZestZapRunner.run(ZestZapRunner.java:126)	at org.mozilla.zest.impl.ZestBasicRunner.runScript(ZestBasicRunner.java:435)	at org.mozilla.zest.impl.ZestScriptEngine.eval(ZestScriptEngine.java:49)	at javax.script.AbstractScriptEngine.eval(AbstractScriptEngine.java:264)	at org.zaproxy.zap.extension.script.ExtensionScript.invokeScriptImpl(ExtensionScript.java:1037)	at org.zaproxy.zap.extension.script.ExtensionScript.invokeScript(ExtensionScript.java:976)	at org.zaproxy.zap.extension.scripts.ConsolePanel$ScriptExecutorThread.run(Unknown Source)