Kaltura_Client_Exception thrown

Invalid KS "MDI1MWEzNmY4Yjc4OWFjNzdhNzc1OGRiYWVjNDMwZjllMjRhZWU5MHwxMDE7OzE0OTg0MDUzNzQ7MjsxNDk4MzE4OTc0LjU3OTc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"