Kaltura_Client_Exception thrown

Invalid KS "MGE3ZWM1M2RlMGVkOWU1MDZmMjgxMWI5NDljMDY2NmZjMGU5NDJjM3wxMDE7OzE0OTAzNTg5NDg7MjsxNDkwMjcyNTQ4Ljg0MDU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"