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java.util.ConcurrentModificationException at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372) at java.util.AbstractList$Itr.next(AbstractList.java:343) at org.apache.jmeter.protocol.http.gui.HTTPArgumentsPanel.getUnclonedParameters(HTTPArgumentsPanel.java:113) at org.apache.jmeter.protocol.http.gui.HTTPArgumentsPanel.createTestElement(HTTPArgumentsPanel.java:92) at org.apache.jmeter.protocol.http.config.gui.UrlConfigGui.modifyTestElement(UrlConfigGui.java:198) at org.apache.jmeter.protocol.http.config.gui.MultipartUrlConfigGui.modifyTestElement(MultipartUrlConfigGui.java:60) at org.apache.jmeter.protocol.http.control.gui.HttpTestSampleGui.modifyTestElement(HttpTestSampleGui.java:115) at org.apache.jmeter.gui.tree.JMeterTreeModel.addComponent(JMeterTreeModel.java:132) at org.apache.jmeter.protocol.http.proxy.ProxyControl.placeSampler(ProxyControl.java:805) at org.apache.jmeter.protocol.http.proxy.ProxyControl.deliverSampler(ProxyControl.java:409) at org.apache.jmeter.protocol.http.proxy.Proxy.run(Proxy.java:296)