Kaltura_Client_Exception thrown

Invalid KS "ODNmZTFjYmExZjQxMzhjZWM0OGFjNTQ3YjRmNzI1Njg3Y2Q3ZGZmZHwxMDE7OzE0NzQ5MzYxMjM7MjsxNDc0ODQ5NzIzLjU1MjY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"