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Getting error when sending email using sendgrid

I have created an azure function to send email using sendgrid but get the below error.

The 'Function1' function is in error: Microsoft.Azure.WebJobs.Host: Error indexing method 'Function1'. Microsoft.Azure.WebJobs.Host: Unable to resolve the value for property 'SendGridAttribute.ApiKey'. Make sure the setting exists and has a valid value

I took the sample from Azure Functions SendGrid bindings - asynchronous

Given in the local.settings.json like below:

{ 
  "IsEncrypted": false,
  "Values": 
  {
    "AzureWebJobsStorage": "UseDevelopmentStorage=true", 
    "FUNCTIONS_WORKER_RUNTIME": "dotnet", 
    "AzureWebJobsServiceBus": " ..." 
    //"AzureWebJobsSendGridApiKey": "..." 
  }
}