Kaltura_Client_Exception thrown

Invalid KS "ZTNhNmU0Nzg5YWMyMDM2OWRkNTFjOWYyZGYxOTFhMjFhZjdkYWZjY3wxMDE7OzE0ODUwNzU4NzU7MjsxNDg0OTg5NDc1LjQwNzY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"