Kaltura_Client_Exception thrown

Invalid KS "MjExNmJkYWM2OTU3NDRlZTQ0ZTdiNWU4ZDJlNTcyZDc1MzkyODQ4YnwxMDE7OzE0NzUzOTkyMTU7MjsxNDc1MzEyODE1LjA4Nzg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"