Hello. I'm writing a simple code to manage a Kafka quota. Took an example from the Pulumi documentation and got a weird error:

error: rpc error: code = Unknown desc = CheckConfig failed because of malformed resource inputs: invalid character '.' after top-level value

My config is very simple:

config:
  kafka:bootstrapServers: "10.10.10.1:9093,10.10.10.2:9093,10.10.10.3:9093"
  kafka:caCert: "/Users/user/Downloads/kafka.crt"
  kafka:clientCert: "/Users/user/Downloads/kafka_certificate.crt"
  kafka:clientKey: "/Users/user/Downloads/kafka_certificate.key"
  kafka:tlsEnabled: "true"

What might be the cause of the error message?