Erro while migrating

Hi there,
My site name is erpnext.dev and i am restoring my site to a previous database.
after executing command bench --site erpnext.dev --force restore [database path] and later frappe subscription command and then executing command

bench --site erpnext.dev migrate
raised an error as the following:

Executing execute:frappe.db.sql("update tabEmployee set prefered_contact_email = IFNULL(prefered_contact_email,’’) ") in erpnext.dev (68aa9e2822a6f0cb)
Traceback (most recent call last):
File “/usr/lib/python2.7/runpy.py”, line 162, in _run_module_as_main
main”, fname, loader, pkg_name)
File “/usr/lib/python2.7/runpy.py”, line 72, in _run_code
exec code in run_globals
File “/home/maverik/frappe-bench/apps/frappe/frappe/utils/bench_helper.py”, line 79, in
main()
File “/home/maverik/frappe-bench/apps/frappe/frappe/utils/bench_helper.py”, line 16, in main
click.Group(commands=commands)(prog_name=‘bench’)
File “/home/maverik/frappe-bench/env/local/lib/python2.7/site-packages/click/core.py”, line 716, in call
return self.main(*args, **kwargs)
File “/home/maverik/frappe-bench/env/local/lib/python2.7/site-packages/click/core.py”, line 696, in main
rv = self.invoke(ctx)
File “/home/maverik/frappe-bench/env/local/lib/python2.7/site-packages/click/core.py”, line 1060, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File “/home/maverik/frappe-bench/env/local/lib/python2.7/site-packages/click/core.py”, line 1060, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File “/home/maverik/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/maverik/frappe-bench/env/local/lib/python2.7/site-packages/click/core.py”, line 534, in invoke
return callback(*args, **kwargs)
File “/home/maverik/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/maverik/frappe-bench/apps/frappe/frappe/commands/init.py”, line 24, in _func
ret = f(frappe._dict(ctx.obj), *args, **kwargs)
File “/home/maverik/frappe-bench/apps/frappe/frappe/commands/site.py”, line 209, in migrate
migrate(context.verbose, rebuild_website=rebuild_website)
File “/home/maverik/frappe-bench/apps/frappe/frappe/migrate.py”, line 30, in migrate
frappe.modules.patch_handler.run_all()
File “/home/maverik/frappe-bench/apps/frappe/frappe/modules/patch_handler.py”, line 29, in run_all
if not run_single(patchmodule = patch):
File “/home/maverik/frappe-bench/apps/frappe/frappe/modules/patch_handler.py”, line 63, in run_single
return execute_patch(patchmodule, method, methodargs)
File “/home/maverik/frappe-bench/apps/frappe/frappe/modules/patch_handler.py”, line 81, in execute_patch
exec patchmodule.split(“execute:”)[1] in globals()
File “”, line 1, in
File “/home/maverik/frappe-bench/apps/frappe/frappe/database.py”, line 148, in sql
self._cursor.execute(query)
File “/home/maverik/frappe-bench/env/local/lib/python2.7/site-packages/MySQLdb/cursors.py”, line 205, in execute
self.errorhandler(self, exc, value)
File “/home/maverik/frappe-bench/env/local/lib/python2.7/site-packages/MySQLdb/connections.py”, line 36, in defaulterrorhandler
raise errorclass, errorvalue
_mysql_exceptions.OperationalError: (1054, “Unknown column ‘prefered_contact_email’ in ‘field list’”)