Kaltura_Client_Exception thrown

Invalid KS "ZmFiYzkxNjkwMDJiYjk3MzgyYmFkMmZhNmM5YzZlOTRlY2Y2NWFjZnwxMDE7OzE0ODEzMTU5NDg7MjsxNDgxMjI5NTQ4LjcyODQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"