Kaltura_Client_Exception thrown

Invalid KS "N2YwN2Q3ZmI3ZTc1N2UwNjEzNmYzNzhjMjI3YTE1NWRiZmI2N2MwMXwxMDE7OzE0OTg1Nzg4NTQ7MjsxNDk4NDkyNDU0LjYwMzg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"