[Webtest] addEventListener is not a function?

[Samuel B. Quiring]

I have received an error message than I cannot interpret.  I am hoping that someone on the list can explain this to me.   Here is an excerpt from my log: . . . [clickButton]  INFO (com.canoo.webtest.steps.Step) - Exception thrown from this class: com.canoo.webtest.engine.StepFailedException [clickButton]  INFO (com.canoo.webtest.steps.Step) - Message was: Step[clickButton "Click the login button" (4/5)]: Script error loading page executing webtest at: clickButton TypeError: addEventListener is not a function, it is null. (http://dev.cayuse.com:8081/V8/jslib/boxover.js#11) [clickButton] Source code: [clickButton] function () { [clickButton]  [native code, arity=0]   In the file boxover.js, referenced in the error message, there are the following lines:    6 if (typeof document.attachEvent!='undefined') {  7    window.attachEvent('onload',init);  8    document.attachEvent('onmousemove',moveMouse);  9    document.attachEvent('onclick',checkMove); } 10 else { 11    window.addEventListener('load',init,false); 12    document.addEventListener('mousemove',moveMouse,false); 13    document.addEventListener('click',checkMove,false); 14 }   -Sam