Kaltura_Client_Exception thrown

Invalid KS "OWI4YzczMzdjNzRjNjRhNjBjYWM4NGYzYzljZmE2ODgxNTZkYzc4ZnwxMDE7OzE0OTM0NzU3NTk7MjsxNDkzMzg5MzU5LjM2NTc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"