The error you're encountering is likely due to a version mismatch between the MongoDB.Driver library and other components in your project, such as Microsoft.EntityFrameworkCore.MongoDB or related MongoDB/Bson libraries. Specifically, the error suggests that the GuidRepresentationMode method is being called but isn't found, which indicates changes or deprecations in the MongoDB.Driver API.

Here’s how you can troubleshoot and resolve this issue:

CHECK MONGODB VERSION Ensure you are using a compatible version of the MongoDB.Driver. The GuidRepresentationMode property was introduced in MongoDB.Driver 2.7. If you're using an older version of the library, upgrade it to the latest stable version compatible with your project.

To check the installed version:

Open the NuGet Package Manager or check your csproj file. Look for the MongoDB.Driver package and its version

to update run this command in your bash terminal dotnet add package MongoDB.Driver --version <latest_version>