Execution problem with button and trigger - google-apps-script

Question

I would admit that I'm not a pro at all, I just try to do some app script for my company and I faced a problem I really don't understand.
I can't execute a function I've made with a button nor with a trigger, but only by doing by my own with the execute button in the app script interface.
The issue is always the same :
Error The coordinates of the target range are outside the dimensions of the sheet.
But as I said above, when I execute by myself I don't receive any error message and the code works well.
Here is the code :
function Colle() {
var spreadsheet = SpreadsheetApp.getActiveSpreadsheet();
var lastRow = spreadsheet.getLastRow()+1;
spreadsheet.setActiveSheet(spreadsheet.getSheetByName('Data GC'), true);
spreadsheet.getRange('A1').activate
spreadsheet.getSheetByName("Data GC").getRange('A1:F500').activate(); // I know that my
//data will never exceed more than 400 so just as a security I've put 500
spreadsheet.setActiveSheet(spreadsheet.getSheetByName('Sauvegarde GC'), true);
spreadsheet.getRange('A' + lastRow).activate();
spreadsheet.getSheetByName("Data GC").getRange('A1:F500').copyTo(spreadsheet.getActiveRange(),
SpreadsheetApp.CopyPasteType.PASTE_VALUES, false);
SuppDoubl(); //Delete the duplicates
spreadsheet.setActiveSheet(spreadsheet.getSheetByName('Sauvegarde GC'), true);
spreadsheet.getRange('A1').activate();
};
*Sorry for my English
function SuppDoubl() {
var spreadsheet = SpreadsheetApp.getActive();
spreadsheet.getRange('A:F').activate();
spreadsheet.getActiveRange().removeDuplicates().activate();
spreadsheet.getRange('A1').activate();
};

Answer 1

Why do you need so many activate()s? If you want just to copy some range from one sheet to other sheet it can be done without activate():
function colle() {
var ss = SpreadsheetApp.getActiveSpreadsheet();
var source = ss.getSheetByName('Data GC').getRange('A1:F500');
var target = ss.getSheetByName('Sauvegarde GC').getRange('A1'); // or A + last row
source.copyTo(target, SpreadsheetApp.CopyPasteType.PASTE_VALUES, false);
// SuppDoubl(); // <-- probably the error is here?
ss.setActiveSheet(ss.getSheetByName('Sauvegarde GC'), true);
ss.getRange('A1').activate();
}
It works fine for me (without the SupDoubl()) via button and any way.