Erpnext V12 to V13 Upgrade Error

At the time of upgrade from v12 to v13, We are getting below error. I used bench update --reset

Error:

Executing erpnext.patches.v13_0.update_project_template_tasks in erp.techseria.com (_7ccb36d7574ec6a5)
Traceback (most recent call last):
File “/usr/lib/python3.6/runpy.py”, line 193, in _run_module_as_main
main”, mod_spec)
File “/usr/lib/python3.6/runpy.py”, line 85, in _run_code
exec(code, run_globals)
File “/opt/erp/frappe-bench/apps/frappe/frappe/utils/bench_helper.py”, line 104, in
main()
File “/opt/erp/frappe-bench/apps/frappe/frappe/utils/bench_helper.py”, line 19, in main
click.Group(commands=commands)(prog_name=‘bench’)
File “/opt/erp/frappe-bench/env/lib/python3.6/site-packages/click/core.py”, line 829, in call
return self.main(*args, **kwargs)
File “/opt/erp/frappe-bench/env/lib/python3.6/site-packages/click/core.py”, line 782, in main
rv = self.invoke(ctx)
File “/opt/erp/frappe-bench/env/lib/python3.6/site-packages/click/core.py”, line 1259, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File “/opt/erp/frappe-bench/env/lib/python3.6/site-packages/click/core.py”, line 1259, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File “/opt/erp/frappe-bench/env/lib/python3.6/site-packages/click/core.py”, line 1066, in invoke
return ctx.invoke(self.callback, **ctx.params)
File “/opt/erp/frappe-bench/env/lib/python3.6/site-packages/click/core.py”, line 610, in invoke
return callback(*args, **kwargs)
File “/opt/erp/frappe-bench/env/lib/python3.6/site-packages/click/decorators.py”, line 21, in new_func
return f(get_current_context(), *args, **kwargs)
File “/opt/erp/frappe-bench/apps/frappe/frappe/commands/init.py”, line 27, in _func
ret = f(frappe._dict(ctx.obj), *args, **kwargs)
File “/opt/erp/frappe-bench/apps/frappe/frappe/commands/site.py”, line 309, in migrate
skip_search_index=skip_search_index
File “/opt/erp/frappe-bench/apps/frappe/frappe/migrate.py”, line 67, in migrate
frappe.modules.patch_handler.run_all(skip_failing)
File “/opt/erp/frappe-bench/apps/frappe/frappe/modules/patch_handler.py”, line 41, in run_all
run_patch(patch)
File “/opt/erp/frappe-bench/apps/frappe/frappe/modules/patch_handler.py”, line 30, in run_patch
if not run_single(patchmodule = patch):
File “/opt/erp/frappe-bench/apps/frappe/frappe/modules/patch_handler.py”, line 71, in run_single
return execute_patch(patchmodule, method, methodargs)
File “/opt/erp/frappe-bench/apps/frappe/frappe/modules/patch_handler.py”, line 91, in execute_patch
frappe.get_attr(patchmodule.split()[0] + “.execute”)()
File “/opt/erp/frappe-bench/apps/erpnext/erpnext/patches/v13_0/update_project_template_tasks.py”, line 36, in execute
is_template = 1
File “/opt/erp/frappe-bench/apps/frappe/frappe/model/document.py”, line 239, in insert
self._validate()
File “/opt/erp/frappe-bench/apps/frappe/frappe/model/document.py”, line 493, in _validate
self._validate_mandatory()
File “/opt/erp/frappe-bench/apps/frappe/frappe/model/document.py”, line 814, in _validate_mandatory
name=self.name))
frappe.exceptions.MandatoryError: [Task, TASK-2021-19089]: tech_stack

[Task, TASK-2021-19089] This task is not available in db