webwork.devMode设置为true会报ognl错误原因

webwork.devMode设置为true会报ognl异常原因?No object in the CompoundRoot has a publicly accessible p

webwork.devMode设置为true会报ognl异常原因

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No object in the CompoundRoot has a publicly accessible property named 'index2' ?webwork.devMode设置为true会报ognl错误原因webwork.devMode设置为true会报ognl错误原因
    #webwork.devMode=true??