Hi, correct it as suggested by Gurvinder and again generate sq code for table my_dcs_productl and run in database. For example if you are using mysql database with xyz database name. then run sql code of my_dcs_product table in xyz database. Then proceed above.
It is clear your property has not been picked up. You are pasting the definition of the file you created. Make sure this property is present or not in definitionFiles property of ProductCatalog component in dyn/admin.
In your another post, there are steps clearly mentioned to check if your changes are being picked or not. Please verify that. It will fix your issue.