EntryPointNotFoundException: Unable to find an entry point named 'OrtGetApiBase' in DLL 'onnxruntime'.

Ratan Kumar Prajapati 1 Reputation point
2021-03-08T14:56:43.083+00:00

I want to make prediction using azure AutoML onnx model in .net core(3.1) console application in visual studio. I have exported onnx model from azure AutoML.

I am following the tutorial link : https://learn.microsoft.com/en-us/azure/machine-learning/how-to-use-automl-onnx-model-dotnet

It says to install following packages (in parenthesis shows the version I am using)
Microsoft.ML (1.5.4)
Microsoft.ML.OnnxRuntime(1.7.0)
Microsoft.ML.OnnxTransformer(1.5.4)

while defining the pipeline
var onnxPredictionPipeline =mlContext.Transforms.ApplyOnnxModel(
outputColumnNames: outputColumns,
inputColumnNames: inputColumns,
ONNX_MODEL_PATH);

I am getting the following error :
System.TypeInitializationException: 'The type initializer for 'Microsoft.ML.OnnxRuntime.NativeMethods' threw an exception.'
EntryPointNotFoundException: Unable to find an entry point named 'OrtGetApiBase' in DLL 'onnxruntime'.

Then I tried with Microsoft.ML.OnnxRuntime.Managed(1.7.1) along with above packages but still getting the same issue.

Please suggest to resolve this issue.

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4 answers

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  1. rakibul Islam 6 Reputation points
    2021-06-03T05:43:45.307+00:00

    In my environment I reproduce the issue after uninstall below redistributable package from control panel.

    Microsoft Visual C++ 2015-2019 Redistributable (x64) -14.29....
    Microsoft Visual C++ 2015-2019 Redistributable (x86) -14.29....

    My OS is Windows 10, Visual Studio 2019

    and installing again this package may solve the issue.

    https://support.microsoft.com/en-us/topic/the-latest-supported-visual-c-downloads-2647da03-1eea-4433-9aff-95f26a218cc0
    Direct Link:
    https://aka.ms/vs/16/release/vc_redist.x86.exe
    and
    https://aka.ms/vs/16/release/vc_redist.x64.exe

    please install those if not install. And try .
    If doesn't work Then Install all C++ for Desktop from Visual Studio Installer.

    1 person found this answer helpful.

  2. Ratan Kumar Prajapati 1 Reputation point
    2021-03-23T11:11:19.33+00:00

    Hi,
    I included the following packages:

    Microsoft.ML (1.5.5)
    Microsoft.ML.OnnxRuntime.Managed(1.7.1)
    Microsoft.ML.OnnxRuntime.MKLML(1.6.0)
    Microsoft.ML.OnnxTransformer(1.5.5)

    It is working now.

    0 comments No comments

  3. Mattia Fabi 1 Reputation point
    2021-05-13T10:30:20.437+00:00

    Hi,
    I included those packages but I am still getting the same error.
    Has anyone else having the same error message and managed to fix it? I read someone else talking about cuda version non compatible, but I don't know what I should do to fix it... Any idea?

    0 comments No comments

  4. T.Mei 1 Reputation point
    2022-11-15T11:42:03.173+00:00

    260506-image.png

    I solved the issue by change Bitness to X64 in project properties --> Web --> Servers.

    0 comments No comments