Kaltura_Client_Exception thrown

Invalid KS "ZTQ3OGZhODUwMWY3YThjMTliNDI3NzJjYzdkM2I5MDdkN2VlNGY1M3wxMDE7OzE0OTM1NTE0NDY7MjsxNDkzNDY1MDQ2LjMwMDI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"