Error with Automation2 on Windows 10 Pro - Could not load file or assembly 'DWSIM.UI.Desktop'

[Alfonso Villegas]

Hello,

I just changed my workstation and I am now operating on Windows 10 Pro, using Microsoft Visual Studio 2019.

Both my old code or the example code snippet to create a flowsheet using Python give the same error:

Message=Could not load file or assembly 'DWSIM.UI.Desktop, Version=7.5.5.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified.
at DWSIM.Automation.Automation2..ctor()
Source=C:\Users\alfonso.villegas\source\repos\PythonApplication2\PythonApplication2\PythonApplication2.py
StackTrace:
File "C:\Users\alfonso.villegas\source\repos\PythonApplication2\PythonApplication2\PythonApplication2.py", line 35, in <module> (Current frame)
interf = Automation2()</module>

Could you help me with this?

[Alfonso Villegas]

Hello,

I am unfortunately still blocked on this issue... I've tried looking for ways to solve this for the past few days but I have not made any progress. I would really appreciate any hint on how to solve this.

Here are a few more information from the Assembly binding log:

Message=Could not load file or assembly 'DWSIM.UI.Desktop, Version=7.5.5.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified.
File name: 'DWSIM.UI.Desktop, Version=7.5.5.0, Culture=neutral, PublicKeyToken=null'
at DWSIM.Automation.Automation2..ctor()

Assembly manager loaded from: C:\Windows\Microsoft.NET\Framework\v4.0.30319\clr.dll
Running under executable C:\Users\alfonso.villegas\AppData\Local\Programs\Python\Python36-32\pythonw.exe
--- A detailed error log follows.

=== Pre-bind state information ===
LOG: DisplayName = DWSIM.UI.Desktop, Version=7.5.5.0, Culture=neutral, PublicKeyToken=null
(Fully-specified)
LOG: Appbase = file:///C:/Users/alfonso.villegas/AppData/Local/Programs/Python/Python36-32/
LOG: Initial PrivatePath = NULL
Calling assembly : DWSIM.Automation, Version=7.5.5.0, Culture=neutral, PublicKeyToken=null.
===**
LOG: This bind starts in LoadFrom load context.
WRN: Native image will not be probed in LoadFrom context. Native image will only be probed in default load context, like with Assembly.Load().
LOG: No application configuration file found.
LOG: Using host configuration file:
LOG: Using machine configuration file from C:\Windows\Microsoft.NET\Framework\v4.0.30319\config\machine.config.
LOG: Policy not being applied to reference at this time (private, custom, partial, or location-based assembly bind).
LOG: Attempting download of new URL file:///C:/Users/alfonso.villegas/AppData/Local/Programs/Python/Python36-32/DWSIM.UI.Desktop.DLL.
LOG: Attempting download of new URL file:///C:/Users/alfonso.villegas/AppData/Local/Programs/Python/Python36-32/DWSIM.UI.Desktop/DWSIM.UI.Desktop.DLL.
LOG: Attempting download of new URL file:///C:/Users/alfonso.villegas/AppData/Local/Programs/Python/Python36-32/DWSIM.UI.Desktop.EXE.
LOG: Attempting download of new URL file:///C:/Users/alfonso.villegas/AppData/Local/Programs/Python/Python36-32/DWSIM.UI.Desktop/DWSIM.UI.Desktop.EXE.
LOG: Attempting download of new URL file:///C:/Users/alfonso.villegas/AppData/Local/DWSIM7/DWSIM.UI.Desktop.DLL.
LOG: Attempting download of new URL file:///C:/Users/alfonso.villegas/AppData/Local/DWSIM7/DWSIM.UI.Desktop/DWSIM.UI.Desktop.DLL.
LOG: Attempting download of new URL file:///C:/Users/alfonso.villegas/AppData/Local/DWSIM7/DWSIM.UI.Desktop.EXE.
LOG: Attempting download of new URL file:///C:/Users/alfonso.villegas/AppData/Local/DWSIM7/DWSIM.UI.Desktop/DWSIM.UI.Desktop.EXE.

Source=C:\Users\alfonso.villegas\source\repos\PythonApplication2\PythonApplication2\PythonApplication2.py
StackTrace:
File "C:\Users\alfonso.villegas\source\repos\PythonApplication2\PythonApplication2\PythonApplication2.py", line 35, in <module> (Current frame)
interf = Automation2()</module>

Thanks a lot,
Alfonso

[Daniel Medeiros]

Did you set

Directory.SetCurrentDirectory(dwsimpath)

correctly?

[Alfonso Villegas]

Hi Daniel,

Yes, I set it to the right folder, the code can access all the .dll files that I reference, the error occurs only when I call interf = Automation2().

This is my code:

import pythoncom
pythoncom.CoInitialize()

import clr

from System.IO import Directory, Path, File
from System import String, Environment

dwsimpath = "C:\\Users\\alfonso.villegas\\AppData\\Local\\DWSIM7\\"

Directory.SetCurrentDirectory(dwsimpath)

clr.AddReference(dwsimpath + "CapeOpen.dll")
clr.AddReference(dwsimpath + "DWSIM.Automation.dll")
clr.AddReference(dwsimpath + "DWSIM.Interfaces.dll")
clr.AddReference(dwsimpath + "DWSIM.GlobalSettings.dll")
clr.AddReference(dwsimpath + "DWSIM.SharedClasses.dll")
clr.AddReference(dwsimpath + "DWSIM.Thermodynamics.dll")
clr.AddReference(dwsimpath + "DWSIM.UnitOperations.dll")

clr.AddReference(dwsimpath + "DWSIM.Inspector.dll")
clr.AddReference(dwsimpath + "DWSIM.MathOps.dll")
clr.AddReference(dwsimpath + "TcpComm.dll")
clr.AddReference(dwsimpath + "Microsoft.ServiceBus.dll")

from DWSIM.Interfaces.Enums.GraphicObjects import ObjectType
from DWSIM.Thermodynamics import Streams, PropertyPackages
from DWSIM.UnitOperations import UnitOperations
from DWSIM.Automation import Automation2
from DWSIM.GlobalSettings import Settings

Directory.SetCurrentDirectory(dwsimpath)

# create automation manager

interf = Automation2()

sim = interf.CreateFlowsheet()

[Daniel Medeiros]

maybe DWSIM is blocked by Windows. Try opening DWSIM.UI.Desktop.exe manually.

[Alfonso Villegas]

Yes, I can open DWSIM.UI.Desktop.exe manually.

[Alfonso Villegas]

Hello,

So the issue was that the installed Python interpreter on the workstation was 32-bit instead of 64-bit. Now everything works!