"找不到对象的屏幕点"怎么处理？

我在运行脚本的时候报“找不到对象的屏幕点”的错误，不知道有没有人遇到过类似的错误，怎么解决？51Testing软件测试网$dQS;Z5C
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源代码：
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RootTestObject root = getRootTestObject();
n+\/De/l'DM$[3_0Subitem subitem = atDescendant(".class", "Html.INPUT.text",".id","queryForm:instanceId");51Testing软件测试网!s8^kU9@)v-Cn
TestObject[] tos = root.find(subitem);51Testing软件测试网1q2s)IVN^
TextGuiTestObject tto = new TextGuiTestObject(tos[0]);51Testing软件测试网%D.N&\
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tto.setText("11111");51Testing软件测试网N^dq ~R/R_-n
...51Testing软件测试网#wWb-N5z(\{
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错误信息：
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exception_context = 在“TextGuiTestObject(Ref:RemoteProxyReference{testContext:9cf7000ec6fa, objectId:3050, testObjectClass:TextGuiTestObject})”上调用了 setText()。
#qA!dIaLZ_0exception_name = com.rational.test.ft.UnsupportedActionException
+Ea'l7}%b0exception_message = 找不到对象的屏幕点
I,w.P0J&KiY0scrīpt_name = TestAll51Testing软件测试网@n7fuWl
scrīpt_id = TestAll.java51Testing软件测试网0p3A KjAhRzia&Ln
line_number = 76
U5WSh Zm-|x`'Kx*Q+?0exception_stack = at com.rational.test.ft.domain.html.HtmlGuiProxy.noScreenPointFoundForAction(HtmlGuiProxy.java:2031)
)q8f'~Az5CIJ$s` Sh0at com.rational.test.ft.domain.html.HtmlGuiProxy.click(HtmlGuiProxy.java:172)51Testing软件测试网)wG,x:K!k e(t"P
at com.rational.test.ft.domain.html.HtmlGuiProxy.click(HtmlGuiProxy.java:147)

RI#A6QN"D0------------------------------51Testing软件测试网FN'x)S5|*h/a)L
at com.rational.test.ft.domain.ProxyUtilities$SetTextFromGlassRunnable.send(ProxyUtilities.java:250)51Testing软件测试网z a:]c:{6SZ;k Y`
------------------------------51Testing软件测试网.n|!g"d6|"u
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at com.rational.test.ft.object.interfaces.TextGuiTestObject.setText(TextGuiTestObject.java:97)51Testing软件测试网 } @jK._.g^
at TestAll.testMain(TestAll.java:76)51Testing软件测试网)G9cZ,RT/ya-W
at org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:78)
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R,nB0at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:92)51Testing软件测试网T:@:cZ[yY)a+t(P3v
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:68)51Testing软件测试网d]^)Y@Bar\ l8W
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:400)51Testing软件测试网
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at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:177)51Testing软件测试网:yRS7n7TycV3g-~&t
at org.eclipse.core.launcher.Main.invokeFramework(Main.java:336)51Testing软件测试网"wd5X*a5E
at org.eclipse.core.launcher.Main.basicRun(Main.java:280)51Testing软件测试网 {T7g5l\#N&Q9M7z
at org.eclipse.core.launcher.Main.run(Main.java:977)
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l0at org.eclipse.core.launcher.Main.main(Main.java:952)