Update:
Problem solved. I have reinstalled EnergyPlus before. The jEPlus can't find "Energy+.idd" file due to different installation path. If anyone encounter the same problem, remember to check the "Energy+.ini" file to make sure the idd file is in the same path. Hope this helps!
My idf file runs well in EnergyPlus and report the output results. But it didnt work for jEPlus. The all_combined_result csv file didn't show message, error, warning. And there is no output variable. Under the folder, there are only "in.imf" and "in.epw".
