Debug a Google Sheet Script - error: Access denied: DriveApp

I have a script in a Google Sheet where I'm getting an exception error: Access denied: DriveApp. There is an Archive function were projects in a Master List are updated. However, when I Archive Completed Projects I get an error: Access denied: DriveApp. I need someone to debug the code and/or otherwise tell me how to fix the issue. The particular piece of code is: function archive(){ var spreadsheet = [login to view URL](); var topSheet = [login to view URL]("Active Projects") var archiveSheet = [login to view URL]("Completed Projects"); var archiveCurrRow = [login to view URL]()+1; var topSheetRows = [login to view URL](); //var sheetFolder = findFolder(targetFolderId,targetFolderName) var archiveFolder = findFolder(archivedProjectsFolderId,archivedProjectsFolderName) var values = [login to view URL](2,10,topSheetRows,1).getValues() var j=2; for(var i = 0 ; i < [login to view URL] ; i ++){ var value = values[i][0]; if (value == ""){break;} var rowValueA = [login to view URL](j,1,1,11).getValues(); var rowValue = rowValueA[0] if(rowValue[5] == "Completed"){ var projectId = getIdFromUrl([login to view URL]("regroupsolutions","")); [login to view URL](projectId) var projectFile = null; try{ projectFile = [login to view URL](projectId); }catch(e){} //var projectFile = [login to view URL](projectId) if(projectFile != null){ [login to view URL](projectFile) //[login to view URL](projectFile) var formulas = [login to view URL](j,1,1,9).getFormulasR1C1(); [login to view URL](archiveCurrRow,1,1,9).setFormulasR1C1(formulas); [login to view URL](archiveCurrRow,10).setValue(rowValue[9]) [login to view URL](j,11).clearContent() [login to view URL](j,10).clearContent() archiveCurrRow = archiveCurrRow +1; } } j += 1; } [login to view URL](5) }