Transport error: PolarSSL

[nulda]

Hi,
when I want to connect, I receive this message

Code: Select all

Transport Error: PolarSSL: SSL read error: x509 - Certificate verification failed, e.g. CRL, CA or signature check failed

I have Samsung Galaxy S3 mini, android 4.1.2
version OpenVPN Connect is 1.1.11 (build44)
Can you advice me?
Thank you