Error when doing push/pull regarding settlement account

Whenever you try to do a push or pull transaction the Sandbox API responds with an error regarding the Settlement Account. Is this error because a bank needs to be added to the destination account or source account? I've even tried the examples but substituting he card for the sandbox card, but I get the same error.

{
    "SC": 400,
    "EC": "3C5E4020",
    "EM": "Settlement Account"
}