What causes the 'await is only valid in async functions' error while fetching weather data from RapidAPI in JavaScript?

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const cityUrl =
  'https://weather-api-ninjas.p.rapidapi.com/v1/weather?city=delhi';
const requestOptions = {
  method: 'GET',
  headers: {
    'X-RapidAPI-Key': 'ce580959b4msh04ac7f304c1ee24p143e88jsncf6cf022f1d6',
    'X-RapidAPI-Host': 'weather-api-ninjas.p.rapidapi.com',
  },
};

(async () => {
  try {
    const apiResponse = await fetch(cityUrl, requestOptions);
    const data = await apiResponse.json();
    console.log(data);
  } catch (error) {
    console.error(error);
  }
})();

I attempted to retrieve weather information from RapidAPI but ran into an issue. I simply copied the provided code snippet for the fetch operation.