selenium脚本在ie浏览器出错提示找不到元素

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抛出异常如下；请求各位伙伴们帮助。


org.openqa.selenium.NoSuchElementException: Unable to find element with id == LNFFTPUR_CPREF (WARNING: The server did not provide any stacktrace information)
Command duration or timeout: 30.11 seconds
For documentation on this error, please visit: http://seleniumhq.org/exceptions/no_such_element.html
Build info: version: '2.40.0', revision: 'fbe29a9', time: '2014-02-19 20:55:11'
System info: host: 'Sc-201409201125', ip: '192.168.1.116', os.name: 'Windows 7', os.arch: 'x86', os.version: '6.1', java.version: '1.6.0_23'
Session ID: 61f7fe7c-964f-4285-a38b-2f9549164d1b
Driver info: org.openqa.selenium.ie.InternetExplorerDriver
Capabilities [{platform=WINDOWS, javascriptEnabled=true, elementScrollBehavior=0, enablePersistentHover=true, ignoreZoomSetting=false, ie.ensureCleanSession=false, browserName=internet explorer, enableElementCacheCleanup=true, unexpectedAlertBehaviour=dismiss, version=10, ie.usePerProcessProxy=false, cssSelectorsEnabled=true, ignoreProtectedModeSettings=true, requireWindowFocus=false, handlesAlerts=true, initialBrowserUrl=http://localhost:38671/, ie.forceCreateProcessApi=false, nativeEvents=true, browserAttachTimeout=0, ie.browserCommandLineSwitches=, takesScreenshot=true}]
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
        at org.openqa.selenium.remote.ErrorHandler.createThrowable(ErrorHandler.java:193)
        at org.openqa.selenium.remote.ErrorHandler.throwIfResponseFailed(ErrorHandler.java:145)
        at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:573)
        at org.openqa.selenium.remote.RemoteWebDriver.findElement(RemoteWebDriver.java:326)
        at org.openqa.selenium.remote.RemoteWebDriver.findElementById(RemoteWebDriver.java:367)
        at org.openqa.selenium.By$ById.findElement(By.java:214)
        at org.openqa.selenium.remote.RemoteWebDriver.findElement(RemoteWebDriver.java:318)
        at Forfaiting.FASTest.testFAB1(FASTest.java:71)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
        at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
        at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
        at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
        at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
        at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
        at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
        at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
        at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
        at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
        at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
        at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
        at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
        at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
        at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
        at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
        at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
        at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
        at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
        at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
        at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

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