Error: ExternalInterface/CalcExternalInterfaceFMUImport: Error when trying to initialize

edit

Hi, i'm having trouble with coupling obFMU to EnergyPlus. I've been using the step by step guideline on obFMU application guide by Lawrence Berkeley National Laboratory. I've created the obFMU files, a IDF file from the OpenStudio tool . When i try to run a EnergyPlus simulation with the IDF file i get this error:

** Severe  ** ExternalInterface/CalcExternalInterfaceFMUImport: Error when trying to instantiate
**   ~~~   ** instance "obm_Office_1" of FMU "obFMU.fmu"
**  Fatal  ** ExternalInterface/StopExternalInterfaceIfError: Error in ExternalInterface: Check EnergyPlus *.err file.

I am using EP version 8.3.1 and obFMU version 1.3.3 Has anyone faced a problem like this before, if yes could you please suggest me how to fix this problem. Thank you