Google Sheets Paste Special values

I am a beginner and need to write a simple script to paste special values in Google sheets. I tried below script, but its not working. Please assist:

function livedata_Function() {var spreadsheet = SpreadsheetApp.getActiveSpreadsheet().getSheetByName("Live_Data");spreadsheet.getRange('L3:T1378').copyTo(spreadsheet.getRange("K3"), SpreadsheetApp.CopyPasteType.PASTE_VALUES, false);

}