How to convert csv to new spread sheet that doesn't exist in drive or import csv as sheet from Gmail [closed]

I want to convert csv file in drive to new sheet by this code:

function importCSVFromGoogleDrive() {var file = DriveApp.getFilesByName("data.csv").next();var csvData = Utilities.parseCsv(file.getBlob().getDataAsString());var sheet = SpreadsheetApp.getActiveSheet();sheet.getRange(1, 1, csvData.length, csvData[0].length).setValues(csvData);}

but the result show:

TypeError: Cannot read property 'getRange' of null

How can I fix it or, is there any code can import csv as sheet from Gmail?