Exception when convert jpg to ai in .net

we will convert jpg to ai like the example link:
https://products.groupdocs.com/conversion/net/jpg-to-ai/

the code “converter.GetPossibleConversions()[“ai”].ConvertOptions” has exception:“Object reference not set to an instance of an object.”,
I found that reason is” converter.GetPossibleConversions()[“ai”]" return null ,
please help me ,thank you.

Code:

// Load JPG file
var converter = new GroupDocs.Conversion.Converter("input.jpg");
// Set conversion parameters for AI format
var convertOptions = converter.GetPossibleConversions()["ai"].ConvertOptions;
// Convert to AI format
converter.Convert("output.ai", convertOptions);

@mycars
This issue is reproduced at our end. Therefore, we have opened the following new ticket(s) in our internal issue tracking system and will deliver their fixes according to the terms mentioned in Free Support Policies.

Issue ID(s): CONVERSIONNET-6172

You can obtain Paid Support Services if you need support on a priority basis, along with the direct access to our Paid Support management team.