BootNotification: ChargerCredentials not mapped #427

I tried to initialise it in the following way:
#define backendUrl "ws://ocpp.xxx"
#define chargeBoxId "8232abdd"
#define chargePointModel "oem"
#define chargePointVendor "oem1"
#define firmwareVersion "1.0"
#define chargePointSerialNumber "001"
#define meterSerialNumber "n00"
#define meterType "onboard Class 3"
#define chargeBoxSerialNumber "123456678"
#define iccid "not present"
#define imsi "imsi not present"

mocpp_initialize(backendUrl, chargeBoxId, ChargerCredentials(chargePointModel, chargePointVendor, firmwareVersion, chargePointSerialNumber, meterSerialNumber, meterType, chargeBoxSerialNumber, iccid, imsi));

I am able to connect to the backend, however, backend is not able to identify parameters such as chargePointModel and other remaining parameters. I obseved that all parameters get bundled into chargePointModel. Below is the response in the server:
[
2,
"2ee7f632-b96f-4f72-8b66-92945ce6205d",
"BootNotification",
{
"chargePointModel": "{"chargeBoxSerialNumber":"123456678","chargePointModel":"oem","chargePointSerialNumber":"001","chargePointVendor":"oem1","firmwareVersion":"1.0","iccid":"not present","imsi":"imsi not present","meterSerialNumber":"n00","meterType":"onboard Class 3"}",
"chargePointVendor": "My Company Ltd."
}
]

Can anyone please help.