Kaltura_Client_Exception thrown

Invalid KS "OTU2MmI2ZTNkMDFkMjFiMWUwZjc2NjYzODg3MmIxMWE1MDkwNTJlMnwxMDE7OzE0NzQ5MjQ1NjQ7MjsxNDc0ODM4MTY0LjA5NDc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"