### Author:  [@danhedaiat](https://discuss.tryton.org/u/danhedaiat)
#### Post date: [April 5, 2023, 2:05pm UTC](https://discuss.tryton.org/t/psycopg2-errors-undefinedtable-relation-model-id-seq-does-not-exist-while-migration-of-my-module/6059/1 "2023-04-05T14:05:08Z")
hi, im try to use `trytond-admin -d test -u z_nurse_call` command, to add my own module to gnuhealth and this is my module:
```auto
class NurseCall(ModelSQL, ModelView):
"Nurse Call"
__name__ = "arnika.nurseCall"
__rec_name = "name"
name = fields.Many2One('gnuhealth.patient', 'Patient')
date = fields.DateTime('Date')
bed = fields.Many2One('gnuhealth.hospital.bed', 'Hospital Bed',)
health_professional = fields.Many2One('gnuhealth.healthprofessional','Health Professional', readonly=True)
@classmethod
def __setup__ (cls):
super(). __setup__ ()
t = cls. __table__ ()
cls._sql_constraints = [
('name_uniq', Unique(t, t.name), 'The Name must be unique !'),]
```
and i get this error :
```auto
3636 140440737433408 [2023-04-05 13:21:46,503] WARNING py.warnings /usr/lib/python3/dist-packages/apport/report.py:13: DeprecationWarning: the imp module is deprecated in favour of importlib; see the module's documentation for alternative uses
import fnmatch, glob, traceback, errno, sys, atexit, imp, stat
Traceback (most recent call last):
File "gnuhealth/tryton/server/trytond-6.0.27/bin/trytond-admin", line 23, in
admin.run(options)
File "/home/gnuhealth/gnuhealth/tryton/server/trytond-6.0.27/trytond/admin.py", line 53, in run
pool.init(update=options.update, lang=list(lang),
File "/home/gnuhealth/gnuhealth/tryton/server/trytond-6.0.27/trytond/pool.py", line 164, in init
restart = not load_modules(
File "/home/gnuhealth/gnuhealth/tryton/server/trytond-6.0.27/trytond/modules/ __init__.py", line 438, in load_modules
_load_modules(update)
File "/home/gnuhealth/gnuhealth/tryton/server/trytond-6.0.27/trytond/modules/ __init__.py", line 406, in _load_modules
load_module_graph(graph, pool, update, lang)
File "/home/gnuhealth/gnuhealth/tryton/server/trytond-6.0.27/trytond/modules/ __init__.py", line 238, in load_module_graph
cls. __register__ (module)
File "/home/gnuhealth/gnuhealth/tryton/server/trytond-6.0.27/trytond/model/modelsql.py", line 228, in __register__
table = cls. __table_handler__ (module_name)
File "/home/gnuhealth/gnuhealth/tryton/server/trytond-6.0.27/trytond/model/modelsql.py", line 212, in __table_handler__
return backend.TableHandler(cls, module_name, history=history)
File "/home/gnuhealth/gnuhealth/tryton/server/trytond-6.0.27/trytond/backend/postgresql/table.py", line 56, in __init__
cursor.execute(
File "/home/gnuhealth/gnuhealth/tryton/server/trytond-6.0.27/trytond/backend/postgresql/database.py", line 74, in execute
cursor.execute(self, sql, args)
psycopg2.errors.UndefinedTable: relation "arnika_nursecall_id_seq" does not exist
```
any help make me happy .
---
### Author:  [@ced](https://discuss.tryton.org/u/ced)
#### Post date: [April 5, 2023, 2:22pm UTC](https://discuss.tryton.org/t/psycopg2-errors-undefinedtable-relation-model-id-seq-does-not-exist-while-migration-of-my-module/6059/2 "2023-04-05T14:22:14Z")
It may be linked to the CamelCase name. But normally we do not remove the case on the table name (nor sequence name). Also before the failing code, there is a test about the existence of the sequence.
---
### Author:  [@ced](https://discuss.tryton.org/u/ced)
#### Post date: [April 5, 2023, 8:17pm UTC](https://discuss.tryton.org/t/psycopg2-errors-undefinedtable-relation-model-id-seq-does-not-exist-while-migration-of-my-module/6059/3 "2023-04-05T20:17:14Z")
Can you elaborate on what was the problem and if we should fix something?
---
### Author:  [@danhedaiat](https://discuss.tryton.org/u/danhedaiat)
#### Post date: [April 8, 2023, 5:24am UTC](https://discuss.tryton.org/t/psycopg2-errors-undefinedtable-relation-model-id-seq-does-not-exist-while-migration-of-my-module/6059/4 "2023-04-08T05:24:25Z")
yep i fix that , as you said its for CamelCase name. thanks to you
---
### Author:  [@ced](https://discuss.tryton.org/u/ced)
#### Post date: [April 8, 2023, 9:08am UTC](https://discuss.tryton.org/t/psycopg2-errors-undefinedtable-relation-model-id-seq-does-not-exist-while-migration-of-my-module/6059/5 "2023-04-08T09:08:28Z")
Indeed there is a bug that prevent Tryton to manage correctly sequences with different cases: [PostgreSQL sequence functions fails with CamelCase names (#12194) · Issues · Tryton / Tryton · GitLab](https://foss.heptapod.net/tryton/tryton/-/issues/12194)
---
### Author:  [@system](https://discuss.tryton.org/u/system)
#### Post date: [May 8, 2023, 9:09am UTC](https://discuss.tryton.org/t/psycopg2-errors-undefinedtable-relation-model-id-seq-does-not-exist-while-migration-of-my-module/6059/6 "2023-05-08T09:09:05Z")
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