Kaltura_Client_Exception thrown

Invalid KS "NmIxYmYzNDNlMTBkYzViZGNlZjBkNzkxN2Q3ZmRkNzA0MGJjN2I0NHwxMDE7OzE0ODEzMTU4ODE7MjsxNDgxMjI5NDgxLjU1NDI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"