Kaltura_Client_Exception thrown

Invalid KS "N2FjY2I3MWI5MjQ4NjMwZGJlODQxNmE1MGQxM2VmYzIzOTlmMmI4OXwxMDE7OzE0OTM0Njc1MzY7MjsxNDkzMzgxMTM2Ljk3ODE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"