Kaltura_Client_Exception thrown

Invalid KS "MGY2OGJiODE5MmRiMTAxNDgxOWY0ZDhlYjlkYTM3ODhiMTExY2MyZnwxMDE7OzE0NzUzNzkzODc7MjsxNDc1MjkyOTg3LjUzNzE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"