error executing PaymentChannelCreate

[Cloud]

I am trying to create a payment channel but getting invalidTransaction error after submitting the signed transaction.

I am able to sign the payload but after submitting it, getting invalidTransaction error:

Below is my request and response:

{
"Account":"r9MWBqXp9BBbLSsJcFUa5cdYrLxpGsEXSf",
"TransactionType":"PaymentChannelCreate",
"Amount":"100",
"Destination":"r9mBvtCB99iKWhxHpyWgWc5nGvcTjdXgk7",
"SettleDe
lay":8640,
"PublicKey":"ED5D5B6FCD85213785D6BAFB791662B978587F94833E4EBB4EC663BD9FDC15A79C",
"DestinationTag":20170428
}

Response:

 <rejected> [RippledError(invalidTransaction)],
 domain:
  Domain {
    domain: null,
    _events: { error: [Function: debugDomainError] },
    _eventsCount: 1,
    _maxListeners: undefined,
    members: [] } }

Any help is highly appreciated .