Kaltura_Client_Exception thrown

Invalid KS "OTAwZTlhYjI4Y2I1ZTczMjA0ZWEyNGMxYmQ4MDlhMzdmZTcwYzM2M3wxMDE7OzE0NzUxNTc0NjY7MjsxNDc1MDcxMDY2LjA5Mzg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"