Kaltura_Client_Exception thrown

Invalid KS "M2YwMzJiNDA3ODhmNjA2MzZlZWE2MDI1NTAyYjlmZWQ3NGQzMGIzOXwxMDE7OzE0NjcxMDc2ODI7MjsxNDY3MDIxMjgyLjY0MjI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"