Kaltura_Client_Exception thrown

Invalid KS "NzJlMGM2ODZmZWQxMWYyOWViYTg0MjExYTU4MTM5YmU2ZWY5N2ExZXwxMDE7OzE0ODUxMTU5NTM7MjsxNDg1MDI5NTUzLjU2MzY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"