Problem with cert in Consul Engine

Hello everyone, i am newbie in vault. I have a 1 nodes with Vault and 1 nodes with Consul which working using TLS on 1 host. I used vault pki engine for this and i want to enable consul engine in Vault for generate consul token i make which showed in this guide:

https://www.vaultproject.io/docs/secrets/consul

Besides in command vault write consul/config/access/ added parameters for configure tls connections:
scheme=https
ca_file=/etc/consul.d/ssl/ca.pem
client_cert=/etc/consul.d/ssl/cert.pem
client_key=/etc/consul.d/ssl/pk.pem
*certificates which vault using to connect with consul

When i try read credentials i got a message:

vault read consul/creds/apache
Error reading from: consul/creds/apache.
URL: /v1/consul/creds/apache
Code: 500
Errors:
1 error occurred:
* tls: failed to find any PEM data in certificate input

Maybe i incorrectly added cert in config consul engine? I tried added in string format but got the same mistake.