Kaltura_Client_Exception thrown

Invalid KS "M2Q2M2RmZjYyYTMyMzNkMmFmMjQ2NzRjNGQ5OGQyMzQ2NzlkZmE2MHwxMDE7OzE0NzUxMTYwOTc7MjsxNDc1MDI5Njk3Ljc4MTg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"