question

I'm trying to delete player account using azure function but I'm getting this error ..

Converting null literal or possible null value to non-nullable type.CS86

Can you help me on how to fix this?

here is the azure code

 using Microsoft.Azure.WebJobs;
 using Microsoft.Azure.WebJobs.Extensions.Http;
 using Microsoft.AspNetCore.Http;
 using Newtonsoft.Json;
 using PlayFab.Samples;
 using PlayFab;
 using PlayFab.AdminModels;
 using Microsoft.Extensions.Logging;
    
    
 namespace Company.Function
 {    public class DeltUsr
     {
         private readonly ILogger _logger;
    
         public DeltUsr(ILoggerFactory loggerFactory)
         {
             _logger = loggerFactory.CreateLogger<DeltUsr>();
         }
    
         [FunctionName("DeltUsr")]            
 public static async Task<PlayFab.PlayFabResult<DeleteMasterPlayerAccountResult>> Run([HttpTrigger(AuthorizationLevel.Anonymous, "get", "post",Route = null)] HttpRequestData req, ILogger log)
 {
     log.LogInformation("C# HTTP trigger function processed a request.");
     FunctionExecutionContext<dynamic> context = JsonConvert.DeserializeObject<FunctionExecutionContext<dynamic>>(await req.ReadAsStringAsync());
     var args = context.FunctionArgument;
     string playFabId = args["MasterID"];
    
     log.LogInformation(playFabId);
     var apiSettings = new PlayFabApiSettings{
         TitleId = Environment.GetEnvironmentVariable("PLAYFAB_TITLE_ID",EnvironmentVariableTarget.Process),
         DeveloperSecretKey = Environment.GetEnvironmentVariable("PLAYFAB_DEV_SECRET_KEY",EnvironmentVariableTarget.Process)
     };
        var adminApi = new PlayFabAdminInstanceAPI(apiSettings);
     var request = new DeleteMasterPlayerAccountRequest(){
         PlayFabId = playFabId};
    
     var ret = await adminApi.DeleteMasterPlayerAccountAsync(request);
     return ret;
 }
     }
        
        
    
 }

Empty warnings I get after adding this CS2AFHelperClasses.cs file