Kaltura_Client_Exception thrown

Invalid KS "MzZkMjg1ZTM0NzdiOTU5NjlmZDk0NjZjZmMwNjVkMGE5Yjk4M2E1NHwxMDE7OzE0ODUyMDQ1MTg7MjsxNDg1MTE4MTE4Ljk5OTg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"