Kaltura_Client_Exception thrown

Invalid KS "ZGM1MzBiNTM0Yjg4OTJkNDE0ZTFlY2RjZjQ3NWMxMGVmMDBjNGI3MnwxMDE7OzE0ODEzOTE4NDc7MjsxNDgxMzA1NDQ3Ljc4MTc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"