Calling function in custom app

1

Trying to call my custom function from my custom app
my file path

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my file name is :e_tax_integration
my function is :submit_document inside class :ETax Integration

so my code is:

frappe.call({
        "method":"frontline_e_tax.frontline_e_tax.doctype.e_tax_integration.ETax_Integration.submit_document",
            args: {
                sales_invoice: frm.doc.name,
               
            },
        
            callback: function (r) {
                if (r.message) {
                    console.log(r.message)
              
            }}
                });

I got this error message below:

ModuleNotFoundError: No module named ‘frontline_e_tax.doctype’