I'm trying to create a button in Google sheets which, when pressed, imports a sheet from a separate spreadsheet into the current one and gives it a name of 'Miscellaneous' followed by the number 1 through to infinity.

For example, the first time the button is pressed it will import a sheet and call it 'Miscellaneous 1' and the second time I press the button it will import a second sheet called 'Miscellaneous 2', so on...

I have the import working and now I'm trying to use a counter to increment the number after 'Miscellaneous'. Can someone tell me what I'm doing wrong? The error is occurring on line 22

var n = 0;

function add() {
    n += 1;
}

function copyFromTemplate(){
  var templateSpreadsheet = SpreadsheetApp.openById('1iXnLkMaPh73lcnkXP1yRV53H824y24FUa1a297OmAKk');
  var template = templateSpreadsheet.getSheets()[0]; //Assuming it is the first sheet

  //The default name will be "Copy of [original name]". We can use this to change it

    add();
  
  var newName = ("Miscellaneous " + n);

  

  
  var currentSpreadsheet = SpreadsheetApp.getActiveSpreadsheet();
  template.copyTo(currentSpreadsheet).setName(newName);

  
}

I'm trying to create a button in Google sheets which, when pressed, imports a sheet from a separate spreadsheet into the current one and gives it a name of 'Miscellaneous' followed by the number 1 through to infinity.

For example, the first time the button is pressed it will import a sheet and call it 'Miscellaneous 1' and the second time I press the button it will import a second sheet called 'Miscellaneous 2', so on...

I have the import working and now I'm trying to use a counter to increment the number after 'Miscellaneous'. Can someone tell me what I'm doing wrong? The error is occurring on line 22

var n = 0;

function countUp() {
    n += 1;
}

function copyFromTemplate(){
  var templateSpreadsheet = SpreadsheetApp.openById('1iXnLkMaPh73lcnkXP1yRV53H824y24FUa1a297OmAKk');
  var template = templateSpreadsheet.getSheets()[0]; //Assuming it is the first sheet

  //The default name will be "Copy of [original name]". We can use this to change it

    countUp();
  
  var newName = ("Miscellaneous " + n);

  

  
  var currentSpreadsheet = SpreadsheetApp.getActiveSpreadsheet();
  template.copyTo(currentSpreadsheet).setName(newName);

  
}