Error: Failed to get method for command

Frappe Framework Customization
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1

Hello,

I have a DocType My Work Order. In the file my_work_order.py file I have put my code and I am calling the code from the .js file with same name, but am getting error as shown below.

Failed to get method for command mymfg.my_mfg.doctype.my_work_order.create_route_card with module 'mymfg.my_mfg.doctype.my_work_order' has no attribute 'create_route_card'

Code of the .js file

var start_btn = frm.add_custom_button(__('Start Production'), function() {
                frappe.call({
                    method: "mymfg.my_mfg.doctype.my_work_order.create_route_card",
                    freeze: true,
                    args: {
                        my_work_order: frm.doc.name,
                        operations: frm.doc.operation
                    },
                    callback: function() {
                        frm.reload_doc();
                    }
                });
                //frappe.throw(__("This feature will be available once <b>Route Card</b> is functional"));
            });
            start_btn.addClass('btn-primary');

How to solve this error.

TIA

Yogi Yang