Upload the .fpfz file here (upload is the 7th icon from the left in the tool bar just above where I'm typing this) by right clicking on the new part in the mine parts bin and clicking export part (which writes the fzpz file) and one of us will look it over and tell you whats wrong. Likely (because of the red background) is improperly specified connectors. You may also want to look at the two parts creation tutorials that I posted in a thread before this just now, but uploading the file will likely be the fastest solution.
Peter