Error while adding new doctype to dashboard


I had created a new doctype and I want to add that to the Purchase order dashboard. I had added the below code in file

‘label’: _(‘Product’),
‘items’: [‘Product’]
while accessing the Purchase Order it is giving below below error.

Server Error
pymysql.err.OperationalError: (1054,“Unknown column ‘tabProduct.purchase_order’ in ‘where clause’”)

Is there anyone who will give me solution to this problem I am facing
Thanks in advance.