deploy contract always return internal server error

[akbariandev]

I started to test your code. It works only for uploading assets and metadata into IPFS. In the next step, when it wants to deploy a collection contract, the toncenter returns an internal server error. Also I tried to call jsonRpc API from tomceter swagger https://testnet.toncenter.com/api/v2/#/json%20rpc/jsonrpc_handler_jsonRPC_post. But again I got 500 error with below details.

{
  "ok": false,
  "error": "LITE_SERVER_UNKNOWN: cannot apply external message to current state : Failed to unpack account state",
  "code": 500
}