Kaltura_Client_Exception thrown

Invalid KS "NjRkYmE4ODhhMGE2NTRkMTQ5Njg3OGRiZTRiY2I1NWViNDVhNTk3YnwxMDE7OzE0NzUyMzcyNjE7MjsxNDc1MTUwODYxLjE0NzY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"