Cannot build the Lean Solution on Visual Studio Community 2017 - The type or namespace name 'Python' and "PyObject" could not be found by Adrien LQ

Adrien LQ INVESTOR

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Expected Behavior

I cannot build the Lean Solution on Visual Studio Community 2017

Actual Behavior

When building I have the following errors (123 of them) composed of :

CS0246 The type or namespace name 'PyObject' could not be found (are you missing a using directive or an assembly reference?
CS0246 The type or namespace name 'Python' could not be found (are you missing a using directive or an assembly reference?Algorithm
CS0006 Metadata file 'C:\Users\adrie\Lean\FILEPATH\NAME_OF_FILE(.dll or .exe)' could not be found

Potential Solution

Cannot find one

System Information

Windows 10;
Visual Studio Community 2017;
ASP.NET 3.5 and 4.7 activated in windows feature;
I followed the LEAN installation procedure and ran all the steps at

https://github.com/QuantConnect/Lean/tree/master/Algorithm.Python#quantconnect-python-algorithm-project

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Adrien LQ

Accepted Answer

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Notebook

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Alexandre Catarino

Hi Adrien LQ , sorry about the incovenience. We have a pending pull request that will solve this issue.
Meanwhile, please move the the file:
Lean\packages\QuantConnect.pythonnet.1.0.5.8\build\Python.Runtime.win to
Lean\packages\QuantConnect.pythonnet.1.0.5.8\lib\Python.Runtime.dll
and rebuild the solution.

Adrien LQ

90 ,

Hello Alexandre.
Thx for the answer.
Yeepaaa !! It works.
I know it would have been something silly like this. It used to appear on the github info page before but i don't know why it was removed.
Thx anyway

Spacetime

10.8k ,

Hello, I have followed the steps provided in setting up LEAN locally and came across same issue listed above.

I have applied the suggested solution and I am still getting the namespace errors. Can you provide any suggestions?

Examples:

Severity Code Description Project File Line Suppression State
Error CS0006 Metadata file 'C:\Users\QuantumLogic\Source\Repos\QuantConnect\Lean\Common\bin\Debug\QuantConnect.Common.dll' could not be found QuantConnect.Api C:\Users\QuantumLogic\Source\Repos\QuantConnect\Lean\Api\CSC 1 Active

Severity Code Description Project File Line Suppression State
Error CS0006 Metadata file 'C:\Users\QuantumLogic\Source\Repos\QuantConnect\Lean\Indicators\bin\Debug\QuantConnect.Indicators.dll' could not be found QuantConnect.Algorithm.CSharp C:\Users\QuantumLogic\Source\Repos\QuantConnect\Lean\Algorithm.CSharp\CSC 1 Active

Severity Code Description Project File Line Suppression State
Error CS0246 The type or namespace name 'Python' could not be found (are you missing a using directive or an assembly reference?) QuantConnect C:\Users\QuantumLogic\Source\Repos\QuantConnect\Lean\Common\Exceptions\KeyErrorPythonExceptionInterpreter.cs 18 Active

Spacetime

10.8k ,

just to add on to this:

The target framework is .NET 4.5.2 instead of .NET 3.5 for all of the solution. Is it mandatory to use .NET 3.5?

Alexandre Catarino

Hi , have you tried this procedure?

Meanwhile, please move the the file:
Lean\packages\QuantConnect.pythonnet.1.0.5.8\build\Python.Runtime.win to
Lean\packages\QuantConnect.pythonnet.1.0.5.8\lib\Python.Runtime.dll
and rebuild the solution.

Spacetime

10.8k ,

Hi Alexandre,

I did try the suggested solution at that time and I was still coming across the same issue.

I have already converted my python algos to C#.

But, if you would like me to reproduce the issue or need anything, then please do let me know.

Kind Regards

Alexandre Catarino

Here is the link to the thread with another community member solution: Running local python algorithm error #4252.

Spacetime

10.8k ,

Thank you for providing the solution.

Adrien LQ INVESTOR

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