Kaltura_Client_Exception thrown

Invalid KS "YmZlMWZiOTIxMWY5ODM1OWZmNDk0MTMxYmU2ZjU2ODg3Yzc1MjhmMHwxMDE7OzE0NzQ5NDI1MzQ7MjsxNDc0ODU2MTM0LjQwMDE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"