Trying to encrypt using pk (elGamal ecc), but getting aes error.

[CashCode]

I'm using sjcl-including-ecc package
keys pair generation (OK):
sjcl.ecc.elGamal.generateKeys(sjcl.ecc.curves.c384);

ct = sjcl.encrypt(sk, JSON.stringify(dataArray), { public: publicKeys })
Gives error:

  toString: [Function (anonymous)],
  message: 'invalid aes key size'
}
    at Object.<anonymous> (\source\index.js:102:11)
    at Module._compile (node:internal/modules/cjs/loader:1105:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1159:10)
    at Module.load (node:internal/modules/cjs/loader:981:32)
    at Function.Module._load (node:internal/modules/cjs/loader:822:12)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:77:12)
    at node:internal/main/run_main_module:17:47

'invalid aes key size'
I don't need AES, I need to encrypt data using my private key using elGamal-ecc