How can I upload my zip file addin without getting an error?

Environment:

.NET console addins

Issue:

It is possible when uploading a zip addin in the Addin Manager that on saving an error occurs saying other DLLs also contains addins. This will prevent saving the addin just uplodaded. The error would show similar to the below image.

Resolution:

The issue occurs because the local AddInValidation folder has not been properly cleaned up. To address the issue and save the zip file addin each affected user needs to follow the below steps.

1. Close the console
2. Delete your equivalent of this folder - C:\Users\UserName\AppData\Local\Temp\AddInValidation\AddInDir
3. Open the console
4. Upload your addin in the Addin Manager
5. Save

The Product Development team is working on a fix for the issue which is scheduled to be applied in an upcoming release