Unable to connect to mqtt over ssl; input too large error #61

I am using this library to connect to mqtt broker with root certificate, client certificate and private key.
I am getting following errors while establishing connection over ssl.

[ 62175][E][ssl_client.cpp:728] perform_ssl_handshake(): mbedtls_ssl_get_record_expansion returned -0xfffffffb
[ 62177][E][ssl_client.cpp:45] _handle_error(): [start_ssl_client():353]: (5) HMAC_DRBG - Input too large (Entropy + additional)