error of "Cross-program invocation with unauthorized signer or writable account"

Question

I am trying to create an ATA using this but i get this error

#[account(
init,
payer = signer,
seeds = [rent_manager.key().as_ref()],
bump,
token::mint = pay_mint,
token::authority = rent_manager,
)]
pub rent_manager_vault: Account<'info, TokenAccount>,

Answer 1

An associated token account by definition already uses its own set of seeds. Try removing the seeds constraint and see if that helps. And update to using the correct associated token constraints:

#[account(
    init,
    payer = payer,
    associated_token::mint = mint,
    associated_token::authority = payer,
)]
pub token: Account<'info, TokenAccount>,

Answer 2

The error was due to i was using wrong seeds for rent_manager_vault

Answer 3

To create an associated token account you need to pass ATA program ID and use the anchor_spl crate with associated_token.

use anchor_spl::{associated_token::AssociatedToken}

....

   #[account(
    init_if_needed,
    payer = signer,
    associated_token::mint = pay_mint,
    associated_token::authority = rent_manager,
    )]
    rent_manager_vault: Account<'info, TokenAccount>,

    ...

    associated_token_program: Program<'info, AssociatedToken>,