Kaltura_Client_Exception thrown

Invalid KS "ZmJiNzE4MGFmNzcxMjM2YmFiMmM5MDQ2NWZiNWYxYzg4NTBhMDkxNnwxMDE7OzE0NzUyMzg5NzE7MjsxNDc1MTUyNTcxLjU0ODc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"