Simulation failed. Message: Transaction simulation failed: Error processing Instruction 0: Cross-program invocation with unauthorized signer or writable account.

[Kadamato]

When I ran this code in test, it gave an error like this

const tx = await program.methods .createStudent(student.name, student.age) .accountsPartial({ student: studentPDA, tokenAccount: tokenAccount, mint: mintPDA, }) .rpc();

this is mint token code

`
let seeds = &["mint".as_bytes(), &[ctx.bumps.mint]];
let signer = [&seeds[..]];

    let cpi_ctx = CpiContext::new_with_signer(
        ctx.accounts.token_program.to_account_info(),
        token::MintTo {
            mint: ctx.accounts.mint.to_account_info(),
            to: ctx.accounts.token_account.to_account_info(),
            authority: ctx.accounts.mint.to_account_info(),
        },
        &signer,
    );

    token::mint_to(cpi_ctx, 1000)?;
    msg!("Minted Tokens");

`