ML.OnnxRuntime Build Error

Curtis Chau

Updated: August 2, 2026

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  # ML.OnnxRuntime Build Error When using the IronBarcode ZIP package, you might encounter the following error message: ```txt Error (active) MSB3027 Could not copy "C:\Users\first\.nuget\packages\microsoft.ml.onnxruntime\1.18.1\runtimes\ios\native\onnxruntime.xcframework\ios-arm64_x86_64-maccatalyst\onnxruntime.framework\Headers\onnxruntime_session_options_config_keys.h" to "bin\Debug\net8.0\runtimes\ios\native\onnxruntime.xcframework\ios-arm64_x86_64-maccatalyst\onnxruntime.framework\Headers\onnxruntime_session_options_config_keys.h". Exceeded retry count of 10. Failed. C:\Program Files\Microsoft Visual Studio\2022\Community\MSBuild\Current\Bin\amd64\Microsoft.Common.CurrentVersion.targets 5034 ``` ## Reason This error occurs when Microsoft.ML.OnnxRuntime is not installed immediately after adding the project references from the IronBarcode ZIP file and before building the entire project. It is related to a file copy operation exceeding the maximum retry count, which is a symptom of the assembly not being set up correctly. ## Solution Unfortunately, this issue appears to be a known problem within the Microsoft build system, and there is no immediate fix within the current project setup. The recommended approach is to create a new project from scratch and reinstall the necessary dependencies in a specific order, which helps ensure that the build system resolves all dependencies correctly and avoids the copy operation error. **Steps to Resolve:** 1. **Create a new project:** Start with a clean slate by creating a new project in your development environment. 2. **Add project reference to IronBarcode DLLs:** Incorporate the IronBarcode libraries by adding the appropriate DLL references in your project settings. 3. **Install Microsoft.ML.OnnxRuntime:** Before building, install the Microsoft.ML.OnnxRuntime package. This can typically be done via NuGet package manager or through the command line using `dotnet add package Microsoft.ML.OnnxRuntime`. 4. **Build the project:** Once all dependencies have been correctly set up and installed, build the project. This order of operations helps ensure that the necessary components are available for the build system to work correctly. By following these steps, you can mitigate the file copying issue and allow the build process to complete successfully.

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When using the IronBarcode ZIP package, you might encounter the following error message:

Error (active) MSB3027
Could not copy "C:\Users\first\.nuget\packages\microsoft.ml.onnxruntime\1.18.1\runtimes\ios\native\onnxruntime.xcframework\ios-arm64_x86_64-maccatalyst\onnxruntime.framework\Headers\onnxruntime_session_options_config_keys.h" to "bin\Debug\net8.0\runtimes\ios\native\onnxruntime.xcframework\ios-arm64_x86_64-maccatalyst\onnxruntime.framework\Headers\onnxruntime_session_options_config_keys.h". Exceeded retry count of 10. Failed.
C:\Program Files\Microsoft Visual Studio\2022\Community\MSBuild\Current\Bin\amd64\Microsoft.Common.CurrentVersion.targets
5034        

Error (active) MSB3027
Could not copy "C:\Users\first\.nuget\packages\microsoft.ml.onnxruntime\1.18.1\runtimes\ios\native\onnxruntime.xcframework\ios-arm64_x86_64-maccatalyst\onnxruntime.framework\Headers\onnxruntime_session_options_config_keys.h" to "bin\Debug\net8.0\runtimes\ios\native\onnxruntime.xcframework\ios-arm64_x86_64-maccatalyst\onnxruntime.framework\Headers\onnxruntime_session_options_config_keys.h". Exceeded retry count of 10. Failed.
C:\Program Files\Microsoft Visual Studio\2022\Community\MSBuild\Current\Bin\amd64\Microsoft.Common.CurrentVersion.targets
5034        

Reason

This error occurs when Microsoft.ML.OnnxRuntime is not installed immediately after adding the project references from the IronBarcode ZIP file and before building the entire project. It is related to a file copy operation exceeding the maximum retry count, which is a symptom of the assembly not being set up correctly.

Solution

Unfortunately, this issue appears to be a known problem within the Microsoft build system, and there is no immediate fix within the current project setup.

The recommended approach is to create a new project from scratch and reinstall the necessary dependencies in a specific order, which helps ensure that the build system resolves all dependencies correctly and avoids the copy operation error.

Steps to Resolve:

1. Create a new project: Start with a clean slate by creating a new project in your development environment.
2. Add project reference to IronBarcode DLLs: Incorporate the IronBarcode libraries by adding the appropriate DLL references in your project settings.
3. Install Microsoft.ML.OnnxRuntime: Before building, install the Microsoft.ML.OnnxRuntime package. This can typically be done via NuGet package manager or through the command line using dotnet add package Microsoft.ML.OnnxRuntime.
4. Build the project: Once all dependencies have been correctly set up and installed, build the project. This order of operations helps ensure that the necessary components are available for the build system to work correctly.

By following these steps, you can mitigate the file copying issue and allow the build process to complete successfully.

Curtis Chau

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Technical Writer

Curtis Chau holds a Bachelor’s degree in Computer Science (Carleton University) and specializes in front-end development with expertise in Node.js, TypeScript, JavaScript, and React. Passionate about crafting intuitive and aesthetically pleasing user interfaces, Curtis enjoys working with modern frameworks and creating well-structured, visually appealing manuals.

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