Kaltura_Client_Exception thrown

Invalid KS "ZTQxZTMwZDdlM2YyZTQ3MzMwN2Q0OTBlN2I3MjM0MjliMzc3ZTQyY3wxMDE7OzE0NzAwMTU2NzE7MjsxNDY5OTI5MjcxLjIxNDk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"