Hi @umarless,
I think, that for, remove the field (net_area) from the database.
Please apply the command.
bench --site [sitename] mariadb
alter table `tabTasmeem Projects` drop column `{net_area}`;
Please set your Doctype name in the tabYour DocType query and field name.
Then exit from the MariaDB.
Then apply another command like
bench --site [sitename] clear-cache
bench --site [sitename] migrate
Then again create the new field and save it form.
Maybe, the problem will solve.
I hope this helps.
Thank You!