PDA sign not working

[toygr]

#[cfg(target_os = "solana")]
        unsafe {
            solana_program::syscalls::sol_invoke_signed_c(
                &instruction as *const InstructionC as *const u8,
                infos.as_ptr() as *const u8,
                infos.len() as u64,
                seeds.as_ptr() as *const u8,
                seeds.len() as u64,
            );
        }

Of course, I used correct seeds and bump.
But it shows error:

"Allocate: 'to' account Address { address: 6gBgxb8eFTTGRnueiY2eD3mcRjND2mQPnT9pmTFAqbKn, base: None } must sign",
    'Program 11111111111111111111111111111111 failed: missing required signature for instruction',