Okay, as you have mentioned when installing custom module, it can be the issue with one who developed it right ? We cannot say all the custom modules are 100% working, there are modules with issues. Just make sure that the module is installed in correct version. Also check the first case am mentioned, regarding the mandatory fields. Or share the link of module here

When i have created it. That time it was working fine. suddenly it stop working and give me above mentioned error.

Sorry i can not share it with you because it is not live yet. it's on localhost.

Then check the data files, there might be some data creating in the model stock.warehouse

Yes i am getting this error psycopg2.IntegrityError: null value in column "company_id" violates not-null constraint

DETAIL: Failing row contains (4, Your New barcode Company, t, null, 43, 44, 45, Your , one_step, ship_only, 46, 47, 48, 49, 16, 18, 19, 17, 16, 20, 13, 11, 12, 1, 2019-12-13 10:53:01.371073, 1, 2019-12-13 10:53:01.371073).

CONTEXT: SQL statement "UPDATE ONLY "public"."stock_warehouse" SET "company_id" = NULL WHERE $1 OPERATOR(pg_catalog.=) "company_id""

when i run odoo in pycharm. In which data file i have to check.

You have to provide the value for company_id field. if you check the video you will understand the issue

Yes i have checked that video but i am confused where i have to provide the value for company_id field because in my created mode there is not any function to pass values like mentioned in video.

The video is case of creating record from python code, in your case it is xml file