Kaltura_Client_Exception thrown

Invalid KS "MWI4ZTI3ZjdhNTM4M2Q0Nzc3NmZjZGFmNGVhNTQ4ZDIxODI0Yjg4YnwxMDE7OzE0OTMwMjEyNDI7MjsxNDkyOTM0ODQyLjAwODE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"