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No se pueden leer las propiedades de nulo (leyendo 'addEventListener') en las extensiones de JavaScript Chrome

Estoy creando extensiones de Chrome usando javascript. Tengo algunos problemas con addEventListeners. Por favor revise el siguiente código

 var SpellCheck = document.getElementById('spellCheck') SpellCheck.addEventListener('click', async () => { let [tab] = await chrome.tabs.query({ active: true, currentWindow: true }); var w = 600; var h = 550; var left = (screen.width / 2) - (w / 2); var top = (screen.height / 2) - (h / 2); chrome.windows.create({ 'url': 'onboarding.html', 'type': 'popup', 'width': w, 'height': h, 'left': left, 'top': top }, function (window) { }); });

pero recibí el siguiente error, ayúdame a solucionar este problema. ingrese la descripción de la imagen aquí

about 4 years ago · Juan Pablo Isaza
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