Kaltura_Client_Exception thrown

Invalid KS "MzI4NjZhNWZlZjg0MzMxZGFiNDBmOGMzZTdmMmVmZTJmZmVmYzMxZHwxMDE7OzE0OTAzODc3NTM7MjsxNDkwMzAxMzUzLjc3Mjc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"