ThreeTen-Backport error on Android - ZoneRulesException: No time-zone data files registered
I'm using ThreeTen-Backport library for my Android project (because java.time is not yet implemented in android development). When I write LocalDate today=LocalDate.now(); or LocalTime time=LocalTime.now(); I get the following exception: Caused by: org.threeten.bp.zone.ZoneRulesException: No time-zone data files registered at org.threeten.bp.zone.ZoneRulesProvider.getProvider(ZoneRulesProvider.java:176) at org.threeten.bp.zone.ZoneRulesProvider.getRules(ZoneRulesProvider.java:133) at org.threeten.bp.ZoneRegion.ofId(ZoneRegion.java:143) at org.threeten.bp.ZoneId.of(ZoneId.java:357) at org