Kaltura_Client_Exception thrown

Invalid KS "MTE4ZGExZjdiNGE2ODM4OWJiNWIzZGQ3ZGNhZjI4YjJiYjAyYmVjMnwxMDE7OzE0OTAzNzQwMTM7MjsxNDkwMjg3NjEzLjgwNTk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"