How to use Query with parameter in Houdini?

Question on Using Queries with Parameters in Houdini

I'm currently working on a SvelteKit project using Houdini for GraphQL integration. I have defined a query in my +page.gql file for logging in a user, which requires two parameters: usernameOremail and password. However, I'm encountering an issue when trying to execute this query from my Svelte component.

Error Message

When I attempt to call the fetch method on my LoginUser store, I receive the following error:

TypeError: Cannot read properties of undefined (reading 'fetch')    at login (/Users/username/Documents/projects/frontend/src/routes/(register)/login/+page.svelte:12:25)    at eval (/Users/username/Documents/projects/frontend/src/routes/(register)/login/+page.svelte:15:2)    ...

GraphQL Query Definition

Here's the query I've defined in +page.gql:

query LoginUser($usernameOremail: String!, $password: String!) {  loginUser(input: { usernameOremail: $usernameOremail, password: $password }) {    token    expiresAt  }}

Svelte Component Code

In my +page.svelte, I have the following code:

<script lang="ts">  import type { PageData } from "./$houdini";  export let data: PageData;  // Access the LoginUser store from the data  $: ({ LoginUser } = data);  // Function to execute the login query with parameters  async function login(usernameOremail: string, password: string) {      try {          // Call the LoginUser store with the input values          const result = await LoginUser.fetch({              variables: { usernameOremail, password }          });          console.log(result.data); // Log the result      } catch (error) {          console.error("Error executing LoginUser query:", error);      }  }  // Example usage  login("my_username", "yourpassword");</script>

Specific Question

1. What could be causing the undefined (reading 'fetch') error when I try to call LoginUser.fetch(), although I see definition on VS code? (=> see. the picture above.)
2. How to use client-side Query with parameter(s). in Houdini?

Any guidance or troubleshooting tips would be greatly appreciated!