Kaltura_Client_Exception thrown

Invalid KS "OTU1MDgyMGUwOGM3NTdkNGEwYmU0MWMxNmYyYmZkOWVmMjk4NmYzZnwxMDE7OzE0NzI1MTY0OTQ7MjsxNDcyNDMwMDk0LjE2NTQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"