Kaltura_Client_Exception thrown

Invalid KS "MTE4N2JlNWVmNTI2N2U1MTU3MjJjOTJiNjZiNDFiMGFjYTdmZDVkNHwxMDE7OzE0OTg3OTc2NjI7MjsxNDk4NzExMjYyLjcyNDQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"