input encrypted emv block is empty (any card)

[wilson-stickytickets]

need some help. every time we do a transaction we always get this response

D/PayPalRetailSDK:flow.step.mtp: MTP response received from API retail/checkouts 
    MTP response: {
        "statusCode": 400,
        "headers": {
            "content-length": "183",
            "content-type": "application/json",
            "date": "Sat, 08 Dec 2018 13:16:09 GMT",
            "http_x_pp_az_locator": "sandbox.slc",
            "paypal-debug-id": "ffa441fe9971e",
            "server": "Apache",
            "set-cookie": "X-PP-SILOVER=; Expires=Thu, 01 Jan 1970 00:00:01 GMT",
            "vary": "Authorization"
        },
        "body": {
            "correlationId": "ffa441fe9971e",
            "errorCode": 580022,
            "errorType": "invalid_field",
            "message": "input encrypted emv block is empty",
            "developerMessage": "input encrypted emv block is empty"
        }
    } 
E/PayPalRetailSDK:flow.step.mtp: MTPError {
      "invoiceCurrency": "AUD",
      "invoiceTotal": "2",
      "formFactors": 1,
      "err": "{\"code\":\"580022\",\"domain\":\"retail\",\"debugId\":\"ffa441fe9971e\"}",
      "statusCode": 400,
      "response": "{\"correlationId\":\"ffa441fe9971e\",\"errorCode\":580022,\"errorType\":\"invalid_field\",\"message\":\"input encrypted emv block is empty\",\"developerMessage\":\"input encrypted emv block is empty\"}"
    }