Kaltura_Client_Exception thrown

Invalid KS "NmY4YjQ4MGZhYTdhYjk3YmExNTE1ODc2M2E1NDEzMjM1ZDRjNTBmNXwxMDE7OzE0NzUwMjk2MTU7MjsxNDc0OTQzMjE1Ljc2NjE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"