Error Code: AccountDidNotSerialize. Error Number: 3004. Error Message: Failed to serialize the account

I am trying to update value of string. I can update if its type is u8, u32, u64, or i64 but cannot update if it's a string type. Any guesses what am I doing wrong?

Code snippet:

1. Program Function

    pub fn set_uri(        ctx: Context<ModifyLedger>,        new_uri: String,    ) -> Result<()> {        let ledger_account = &mut ctx.accounts.ledger_account;        ledger_account.uri = new_uri;            Ok(())    }

2. derive Account:

#[derive(Accounts)]pub struct ModifyLedger<'info> {    #[account(mut)]    pub ledger_account: Account<'info, Ledger>,    #[account(mut)]    pub wallet: Signer<'info>,}

3. Account:

#[account]pub struct Ledger {    pub uri: String,}