Kaltura_Client_Exception thrown

Invalid KS "ZGI1NTllMGEzNmRhOTk2NTliMTgxY2UyMmQzMDVjY2NjZjkxMzM4M3wxMDE7OzE0NzQ4NTAyMjg7MjsxNDc0NzYzODI4Ljg3NzE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"