Kaltura_Client_Exception thrown

Invalid KS "ZjdhNTU2MGJiNDVlYzk5MDI0MTcxYzk2NDYxY2Y0ZGI0YjYwZTFmNHwxMDE7OzE0OTM0NTMxMTQ7MjsxNDkzMzY2NzE0Ljg1MTQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"