Kaltura_Client_Exception thrown

Invalid KS "YzdlNDk3ODNmN2I0ZjA3ZGUzZTlhZTZjOGJiNjRhNTMxMGQ2N2E4M3wxMDE7OzE0ODgwMTI1NTc7MjsxNDg3OTI2MTU3Ljc5OTQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"