Kaltura_Client_Exception thrown

Invalid KS "ZjQyZTZiNjU1MjQ3NTBmN2ZkZGE1MzNiOTc5OTJhMzYxMzQ1NTRiOHwxMDE7OzE0ODQ5OTM0MzI7MjsxNDg0OTA3MDMyLjA3MzI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"