Kaltura_Client_Exception thrown

Invalid KS "NTU2NGE5MDA0NDY5NzE4NDU1OTZlYzgxM2U4ZmMzNGIxYjNmNTM5YXwxMDE7OzE0ODE0MTMyNjQ7MjsxNDgxMzI2ODY0Ljc5MTY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"