Kaltura_Client_Exception thrown

Invalid KS "NTBiYjc4ZmM2Y2EyZWIwYTUyMDcwOTQ2MTViNmEyNDU4N2I3MWEzZnwxMDE7OzE0ODUxNDM5MjI7MjsxNDg1MDU3NTIyLjk4MzM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"