Error on Update command bench update --upgrade

Executing erpnext.patches.v7_2.update_assessment_modules in site1.local (1bd3e0294d)
Traceback (most recent call last):
File “/usr/lib/python2.7/runpy.py”, line 162, in runmodule_as_main
“main”, fname, loader, pkg_name)
File “/usr/lib/python2.7/runpy.py”, line 72, in runcode
exec code in run_globals
File “/home/erp/frappe-bench/apps/frappe/frappe/utils/bench_helper.py”, line 79, in
main()
File “/home/erp/frappe-bench/apps/frappe/frappe/utils/bench_helper.py”, line 16, in main
click.Group(commands=commands)(prog_name=‘bench’)
File “/home/erp/frappe-bench/env/local/lib/python2.7/site-packages/click/core.py”, line 716, in call
return self.main(*args, **kwargs)
File “/home/erp/frappe-bench/env/local/lib/python2.7/site-packages/click/core.py”, line 696, in main
rv = self.invoke(ctx)
File “/home/erp/frappe-bench/env/local/lib/python2.7/site-packages/click/core.py”, line 1060, in invoke
return processresult(sub_ctx.command.invoke(sub_ctx))
File “/home/erp/frappe-bench/env/local/lib/python2.7/site-packages/click/core.py”, line 1060, in invoke
return processresult(sub_ctx.command.invoke(sub_ctx))
File “/home/erp/frappe-bench/env/local/lib/python2.7/site-packages/click/core.py”, line 889, in invoke
return ctx.invoke(self.callback, **ctx.params)
File “/home/erp/frappe-bench/env/local/lib/python2.7/site-packages/click/core.py”, line 534, in invoke
return callback(*args, **kwargs)
File “/home/erp/frappe-bench/env/local/lib/python2.7/site-packages/click/decorators.py”, line 17, in new_func
return f(get_current_context(), *args, **kwargs)
File “/home/erp/frappe-bench/apps/frappe/frappe/commands/init.py”, line 24, in _func
ret = f(frappe._dict(ctx.obj), *args, **kwargs)
File “/home/erp/frappe-bench/apps/frappe/frappe/commands/site.py”, line 214, in migrate
migrate(context.verbose, rebuild_website=rebuild_website)
File “/home/erp/frappe-bench/apps/frappe/frappe/migrate.py”, line 31, in migrate
frappe.modules.patch_handler.run_all()
File “/home/erp/frappe-bench/apps/frappe/frappe/modules/patch_handler.py”, line 29, in run_all
if not run_single(patchmodule = patch):
File “/home/erp/frappe-bench/apps/frappe/frappe/modules/patch_handler.py”, line 63, in run_single
return execute_patch(patchmodule, method, methodargs)
File “/home/erp/frappe-bench/apps/frappe/frappe/modules/patch_handler.py”, line 83, in execute_patch
frappe.get_attr(patchmodule.split()[0] + “.execute”)()
File “/home/erp/frappe-bench/apps/erpnext/erpnext/patches/v7_2/update_assessment_modules.py”, line 6, in execute
frappe.rename_doc(“DocType”, “Grading Structure”, “Grading Scale”, force=True)
File “/home/erp/frappe-bench/apps/frappe/frappe/init.py”, line 668, in rename_doc
return rename_doc(*args, **kwargs)
File “/home/erp/frappe-bench/apps/frappe/frappe/model/rename_doc.py”, line 42, in rename_doc
rename_parent_and_child(doctype, old, new, meta)
File “/home/erp/frappe-bench/apps/frappe/frappe/model/rename_doc.py”, line 99, in rename_parent_and_child
(new, old))
File “/home/erp/frappe-bench/apps/frappe/frappe/database.py”, line 138, in sql
self._cursor.execute(query, values)
File “/home/erp/frappe-bench/env/local/lib/python2.7/site-packages/MySQLdb/cursors.py”, line 205, in execute
self.errorhandler(self, exc, value)
File “/home/erp/frappe-bench/env/local/lib/python2.7/site-packages/MySQLdb/connections.py”, line 36, in defaulterrorhandler
raise errorclass, errorvalue
mysqlexceptions.IntegrityError: (1062, “Duplicate entry ‘Grading Scale’ for key ‘PRIMARY’”)

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