mint_to instruction is failing ,`Program logged: "Error: InvalidAccountData"`with this error

Question

I'm using this code to mint

let cpi_accounts = MintTo {
            mint: ctx.accounts.mint.to_account_info(),
            to: ctx.accounts.ata.to_account_info(),
            authority: ctx.accounts.owner.to_account_info(),
        };
        let cpi_program = ctx.accounts.token_program.to_account_info();

        let cpi_ctx = CpiContext::new(cpi_program, cpi_accounts);

        token::mint_to(cpi_ctx, 1)?;

and i'm getting this log

Program invoked: Token Program
  > Program logged: "Instruction: MintTo"
  > Program logged: "Error: InvalidAccountData"
  > Program consumed: 1261 of 190597 compute units
  > Program returned error: "invalid account data for instruction"
> Program consumed: 10664 of 200000 compute units

previously it was working, but it suddenly stopped working

Answer 1

InvalidAccountData can unfortunately mean many things, but most likely the mint account hasn't been created / initialized, or the token account hasn't been created / initialized.