Shopify shipping revenue

So i have a ‘Standard Shipping’ charge from shopify, that i mapped to “Shipping Income” under direct income. This is the error that occurs when i sync

Traceback (most recent call last):
File “/home/frappe/frappe-bench/apps/erpnext_shopify/erpnext_shopify/sync_orders.py”, line 22, in sync_shopify_orders
create_order(shopify_order, shopify_settings)
File “/home/frappe/frappe-bench/apps/erpnext_shopify/erpnext_shopify/sync_orders.py”, line 54, in create_order
create_sales_invoice(shopify_order, shopify_settings, so)
File “/home/frappe/frappe-bench/apps/erpnext_shopify/erpnext_shopify/sync_orders.py”, line 98, in create_sales_invoice
si.submit()
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 723, in submit
self._submit()
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 712, in _submit
self.save()
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 233, in save
return self._save(*args, **kwargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 252, in _save
self.insert()
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 203, in insert
self.run_before_save_methods()
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 753, in run_before_save_methods
self.run_method(“validate”)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 651, in run_method
out = Document.hook(fn)(self, *args, **kwargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 879, in composer
return composed(self, method, *args, **kwargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 862, in runner
add_to_return_value(self, fn(self, *args, **kwargs))
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 645, in
fn = lambda self, *args, **kwargs: getattr(self, method)(*args, **kwargs)
File “/home/frappe/frappe-bench/apps/erpnext/erpnext/accounts/doctype/sales_invoice/sales_invoice.py”, line 82, in validate
self.set_against_income_account()
File “/home/frappe/frappe-bench/apps/erpnext/erpnext/accounts/doctype/sales_invoice/sales_invoice.py”, line 366, in set_against_income_account
self.against_income_account = ‘,’.join(against_acc)
TypeError: sequence item 0: expected string or Unicode, NoneType found

It seems income account is missing. Please set default income account in company.