Kaltura_Client_Exception thrown

Invalid KS "OTlhOThjNDE5M2U5MDZjOGQxOTQ2NTFiMmMyNzk2NTc0NGMxYzk0MXwxMDE7OzE0ODUxMTU4NjI7MjsxNDg1MDI5NDYyLjI3NDU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"