The type initializer for '' threw an exception

Aspose.Cells Product Family
1

Hi All, I’m running into this error when exporting an excel workbook to PDF in a .NET 6 project running on Alpine Linux: The type initializer for ‘’ threw an exception.

I’ve tried adding the following lines of code to the Dockerfile but I’m still getting the same error:
RUN apk update && apk add -U --no-cache libgdiplus
RUN cd /usr/lib && ln -s libgdiplus.so gdiplus.dll
RUN apk update && apk add -U --no-cache libc6-compat

I was originally using Aspose.Cells v25.1.0, then I upgraded to the latest, v25.8.0 but still same error.

Any help would be greatly appreciated!

2

@shaishavj

The error message “The type initializer for ‘’ threw an exception” typically indicates an issue with the initialization of a type, often related to missing dependencies or configuration issues, especially in a Linux environment like Alpine.

Cause: This error can arise due to missing libraries or fonts required by Aspose.Cells when exporting an Excel workbook to PDF in a .NET 6 project on Alpine Linux.

Solution: Here are the steps to troubleshoot and resolve the issue:

  1. Ensure All Dependencies Are Installed: You mentioned adding libgdiplus and libc6-compat to your Dockerfile. Make sure you also have the following dependencies installed:

    • fontconfig
    • libc6
    • libgdiplus
    • libx11
    • libxrender
    • libxext

    Update your Dockerfile to include these dependencies:

    RUN apk add --no-cache \
    libgdiplus \
    libc6-compat \
    fontconfig \
    libx11 \
    libxrender \
    libxext

  2. Check for Missing Fonts: Missing fonts can cause issues when rendering documents. Ensure that you have the necessary fonts installed in your Alpine image. You can install common fonts using:

    RUN apk add --no-cache ttf-dejavu

  3. Verify the .NET Environment: Ensure that your .NET environment is correctly set up for running on Alpine. Confirm that you are using the correct base image for .NET 6.

  4. Test with a Simple Workbook: Create a minimal example that just initializes a workbook and saves it to PDF. This can help isolate whether the issue is with your specific workbook or the environment setup. Here’s a simple code snippet to test:

    using Aspose.Cells;

var workbook = new Workbook();
workbook.Worksheets[0].Cells["A1"].PutValue("Hello, Aspose!");
workbook.Save("output.pdf", SaveFormat.Pdf);

  5. Check Logs for More Details: If the error persists, check the logs for any additional details that might indicate what is going wrong during the initialization.

Next Steps: Implement the above solutions in your Dockerfile and test the minimal workbook example. If the issue continues, please provide any error logs or additional context for further assistance.

Let me know if these steps help resolve the issue or if you need further assistance!

3

@shaishavj,

Please refer to other thread for your reference especially the reply to cope with your issue. Also, refer to the sample docker file in the document for your further reference.

Let us know if you still find the issue.

4

I tried various configurations using both the posts above and what solved it for me, at least locally for the moment, is the following:

  1. Update the Aspose.Cell Nuget package to 25.8.0
  2. Install SkiaSharp.NativeAssets.Linux package and specific version only: 2.88.6
  3. Added line to Dockerfile: RUN apk update && apk add --no-cache fontconfig

Does this make any sense?

Thanks!

5

@shaishavj,

We are glad to hear that you resolved your issue by installing the SkiaSharp.NativeAssets.Linux package with a specific version and updating your Dockerfile. If you have any additional questions or comments, please do not hesitate to reach out to us.