Kaltura_Client_Exception thrown

Invalid KS "NDBmMzI2ZDhhNGExMjFmNjgwNDg2M2RiN2E3MGE4OTQwNjE1MTRkM3wxMDE7OzE0OTM2OTIyNDU7MjsxNDkzNjA1ODQ1LjU4MDM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"