Use of Intermediate Message Events(webMethods)

I am trying to use an Intermediate message event in my process to receive publishable doc (to join already running process instance). But I am getting the following error while building the process


process details.docx (205 KB)


I believe it is referring to Properties->Inputs/outputs, browse to the page and try click the REFRESH icon to see if it bring out the output format you use
Output Properties.png