why my node has problem when added into the knime disk plugins

hi 

    I test my own node in knime SDK, I could find result in output port . than I export this plugins and copy the  *.jar into  plugins that belong to the knime disk. but when I exec my node in knime disk ,I found  no result in the output port? why ?   Could it wrong  than loaded into the knime disk methods ?

can you help me ?

I had to solve this problem.