Kaltura_Client_Exception thrown

Invalid KS "NzQxMzlmZmU3MzI3OGNiMzUxMjNmNmU2Y2UwNTM1MTlhMjkyNGJkZnwxMDE7OzE0NzU0MTI0NDM7MjsxNDc1MzI2MDQzLjMwNzI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"