REST copyTo Method in SharePoint Online

I'm trying to make a copy of a MS Word document and add it to a document library in SharePoint Online with the below code, which runs once without firing the success or fail message, and throws "SP.RequestExecutor is not a constructor" on subsequent executions. I have jQuery referenced on the master page.

What am I missing?

function copy() {
  var hostweburl = decodeURIComponent("https://myWeb.sharepoint.com"); 
  var appweburl = decodeURIComponent("https://myWeb.sharepoint.com/mySite"); 

  $.getScript(hostweburl + "/_layouts/15/SP.RequestExecutor.js");
  
  var executor = new SP.RequestExecutor(appweburl);
  var url = "https://myWeb.sharepoint.com/mySite/_api/web/folders/getByUrl('mySite/Deviations/Forms/Deviations/')/Files/getByUrl('template.docx')/copyTo(strNewUrl = 'mySite/Deviations/myTestDev.docx', bOverWrite = true)";
  executor.executeAsync({
    url: url,
    method: "POST",
    binaryStringResponseBody: true,
    success: successHandler,
    error: errorHandler
  });


  function successHandler() {
    console.log('success');
  };

  function errorHandler(errMsg) {
    console.log('fail ' + errMsg);
  };
}

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