Http: TLS handshake error from 127.0.0.1: remote error: tls: unknown certificate authority

Hi,
i am setting up tk-gateway with ssl certificate, I have followed the documenation but its not working,
my configuration is bellow:-

“http_server_options”: {
“enable_http2”: false,
“enable_websockets”: true,
“use_ssl”: true,
“certificates”: [
{
“domain_name”: “api.location.com”,
“cert_file”: “/opt/tyk-gateway/api_location_com.crt”,
“key_file”: “/opt/tyk-gateway/api.location.key”

}

]

My ssl provider sent me this files
• Root CA Certificate - AAACertificateServices.crt
• Intermediate CA Certificate - USERTrustRSAAAACA.crt
• Intermediate CA Certificate - SectigoRSADomainValidationSecureServerCA.crt
• Your PositiveSSL Trial Certificate - api_location_com.crt

I think i need to include the cabundle in the ssl configuration but I dont understnad how to do that in tyk.conf

Can any one please help me ,

in the log i get

Jun 10 19:06:42 location tyk[10148]: 2020/06/10 19:06:42 http: TLS handshake error from 127.0.0.1:43908: remote error: tls: unknown certificate authority
Jun 10 19:34:29 location tyk[10148]: 2020/06/10 19:34:29 http: TLS handshake error from 127.0.0.1:44130: remote error: tls: unknown certificate authority