Kaltura_Client_Exception thrown

Invalid KS "NWNlMGZjZmU3OTg1MDUxZWQ2Yjk1OGY1NzI4YmQzMzg4MDY2MzI4NnwxMDE7OzE0OTMxMjcyODI7MjsxNDkzMDQwODgyLjQxNjM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"