Kaltura_Client_Exception thrown

Invalid KS "ZTQ3M2MzNjM1M2Q1MGQ2MTZkMTMyMDA1YWNjZmMzNjU3YWU5NDNjN3wxMDE7OzE0NzU0MTgxMTQ7MjsxNDc1MzMxNzE0LjQwMDI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"