Import item problem

Hello
I want to import items to erpnext but i get bellow error when i open log . any one know what’s issue ?

Traceback (most recent call last):
File “/home/frappe/frappe-bench/apps/frappe/frappe/core/doctype/data_import/importer.py”, line 395, in upload
doc.insert()
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 215, in insert
self.set_new_name()
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 375, in set_new_name
set_new_name(self)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/naming.py”, line 38, in set_new_name
doc.run_method(“autoname”)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 758, in run_method
out = Document.hook(fn)(self, *args, **kwargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 1027, in composer
return composed(self, method, *args, **kwargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 1010, in runner
add_to_return_value(self, fn(self, *args, **kwargs))
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 752, in
fn = lambda self, *args, **kwargs: getattr(self, method)(*args, **kwargs)
File “/home/frappe/frappe-bench/apps/erpnext/erpnext/stock/doctype/item/item.py”, line 47, in autoname
self.item_code = make_autoname(self.naming_series+’.#####’, doc=self)
TypeError: unsupported operand type(s) for +: ‘NoneType’ and ‘unicode’

Hi @meisam

Seems you have not added series column in the excel sheet, kindly download the template with column series and set the correct series in the template and try to import the file again

solved thanks so much