missing method exception

[sapsari]

Describe the bug
Getting exception below when trying to use OpenAIService as Microsoft.Extensions.AI.IChatClient
Using the .netstandard2.0 version

Your code piece

	completionResponse = ChatClient.CompleteStreamingAsync(chatMessages, options, cancellationToken);
	iterator = completionResponse.GetAsyncEnumerator();
        more = await iterator.MoveNextAsync();

Result
Exception thrown at iterator.MoveNextAsync()

Expected behavior
No exceptions

Desktop (please complete the following information):

• OS: Windows 10
• Target framework of application is .NET 9.0
• D:_nuget\betalgo.ranul.openai\9.0.1\lib\netstandard2.0\Betalgo.Ranul.OpenAI.dll
• D:_nuget\microsoft.extensions.ai.abstractions\9.1.0-preview.1.25064.3\lib\netstandard2.0\Microsoft.Extensions.AI.Abstractions.dll

Exception
System.MissingMethodException
HResult=0x80131513
Message=Method not found: 'System.String Microsoft.Extensions.AI.ChatResponseFormatJson.get_Schema()'.
Source=Betalgo.Ranul.OpenAI
StackTrace:
at Betalgo.Ranul.OpenAI.Managers.OpenAIService.CreateRequest(IList`1 chatMessages, ChatOptions options)
at Betalgo.Ranul.OpenAI.Managers.OpenAIService.d__32.MoveNext()
at Betalgo.Ranul.OpenAI.Managers.OpenAIService.d__32.System.Threading.Tasks.Sources.IValueTaskSource<System.Boolean>.GetResult(Int16 token)
at Meryel.Comment2GPT.GptCore.ExtensionsAiAdapter.d__10.MoveNext() in D:\Develop\Comment2GPT\src\GptCore\ExtensionsAiAdapter.cs:line 172