Kaltura_Client_Exception thrown

Invalid KS "YmQ0Y2I2MWVmZmI5ZTY1OGU1OTA1YmEyYzY4MzhlMzlkMDJiYWE4YXwxMDE7OzE0NzUyNzUxNjk7MjsxNDc1MTg4NzY5LjQyMDQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"