Kaltura_Client_Exception thrown

Invalid KS "ZDM3MWUxMTg1NGU3YjBlZjhhMjU3YjQ2MzkxNWU4MWExMGIzZDI3Y3wxMDE7OzE0ODUzNjU5MTQ7MjsxNDg1Mjc5NTE0Ljk5NTU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"