I only created two files ('drug.py  and drug_views.xml) to add a new field to an existing form view

from odoo import fields, models 
class Drug(models.Model): 
    _inherit = "product.template" 
    drug_name = fields.Char(string="Drug Name", 
                help="Name of the drug",required=True)

<?xml version="1.0" encoding="UTF-8" ?>
<odoo>
    <record id="view_drug_view_form" model="ir.ui.view">
        <field name="name">
            drug.view.form.inherit.odoo.hotel.management
        </field>
        <field name="model">product.template</field>
        <field name="inherit_id"      ref="product.product_template_only_form_view"/>
        <field name="arch" type="xml">
            <xpath expr="//field[@name='invoice_policy']" position="after">
                <field name="drug_name"/>
            </xpath>
        </field>
    </record>
</odoo> 

Error Message says:

File "/Users/hellohein/Desktop/odoo_pharmacy/community/odoo/tools/misc.py", line 226, in file_path
    raise FileNotFoundError("File not found: " + file_path)
FileNotFoundError: File not found: pharmacy_management_odoo/views/durg_views.xml

The above server error caused the following client error:
RPC_ERROR: Odoo Server Error
    RPC_ERROR
        at makeErrorFromResponse (http://localhost:8070/web/assets/9a60bde/web.assets_web.min.js:3149:163)
        at XMLHttpRequest.<anonymous> (http://localhost:8070/web/assets/9a60bde/web.assets_web.min.js:3154:13)