Kaltura_Client_Exception thrown

Invalid KS "MDEwMjU0MDc0MDM5N2E1ZTZhYTM4ZDQwOWIyYTg0ZDcyNDdiODc1NnwxMDE7OzE0OTg4MDA3MjY7MjsxNDk4NzE0MzI2LjIzMjg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"