Can't reach backend code

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1

I have a backend web module (back1.jsw) and it has a simple function like the following:

export function createContact(email, name) {
 return wixCrmBackend.createContact({
 "firstName": name,
 "lastName": '',
 "emails": [email],
 "phones": []
    }).then(id => { return id });
}

Then I call this function from a client-side code like the following:

import { createContact } from 'backend/backs';  
export function SbmtBtn_click(event) {
 return createContact( $w('#emailBox').value, $w('#nameBox').value).then(rslt => { 
                    console.log('sent ' + rslt); 
                });
}

I have no code errors, but when publishing and opening the published site, I got ‘Uncaught’ error.
But if I moved the backend function to the client-side code it runs.
Till yesterday everything was working, but now I don’t know what is the problem?
Any responses will be highly appreciated.

2

Which one is correct, your file name or the import?

I have a backend web module (back1.jsw)  

import { createContact } from 'backend/backs';