diff --git a/erpnext/patches/v12_0/set_gst_category.py b/erpnext/patches/v12_0/set_gst_category.py
index 54bc5b3..55bbdee 100644
--- a/erpnext/patches/v12_0/set_gst_category.py
+++ b/erpnext/patches/v12_0/set_gst_category.py
@@ -7,6 +7,8 @@
 	if not company:
 		return
 
+	frappe.reload_doc('accounts', 'doctype', 'Tax Category')
+
 	make_custom_fields()
 
 	for doctype in ['Sales Invoice', 'Purchase Invoice']:
diff --git a/erpnext/setup/doctype/company/company.py b/erpnext/setup/doctype/company/company.py
index 2eee919..ff35154 100644
--- a/erpnext/setup/doctype/company/company.py
+++ b/erpnext/setup/doctype/company/company.py
@@ -14,6 +14,7 @@
 from frappe.contacts.address_and_contact import load_address_and_contact
 from frappe.utils.nestedset import NestedSet
 
+from past.builtins import cmp
 import functools
 
 class Company(NestedSet):