Caldav integration

Hello,
I’m trying to create rules based on public google calendars (holidays for example).
I’ve added caldav-io binding and caldav-personal jars addons (1.8.2).
Added this to the configuration:

caldavPersonal:usedCalendars=cal_holidays
caldavio:cal_holidays:url=Holidays in Israel

Added items to my items file:

String cal_holiday “Date now [%s]” { caldavPersonal=“calendar:cal_holidays type:ACTIVE eventNr:1 value:NAME” }
DateTime cal_holiday_time “Beginning [%1$tT, %1$td.%1$tm.%1$tY]” { caldavPersonal=“calendar:cal_holidays type:ACTIVE eventNr:1 value:START” }

and when I’m running openhab I’m getting those errors:

[DEBUG] [o.i.c.internal.CalDavActivator] - CalDav Calendar IO has been started.
[TRACE] [.i.c.internal.CalDavLoaderImpl] - configuration parameter: cal_holidays:preloadTime
[TRACE] [.i.c.internal.CalDavLoaderImpl] - configuration parameter: cal_holidays:url
[TRACE] [.i.c.internal.CalDavLoaderImpl] - configuration parameter: service.pid
[DEBUG] [o.b.c.internal.CalDavActivator] - CalDav-Presence binding has been started.
[TRACE] [.c.i.CalDavBindingProviderImpl] - found values: calendar=[cal_holidays], type=ACTIVE, eventNr=1, value=NAME
[DEBUG] [.c.i.CalDavBindingProviderImpl] - adding item: cal_holiday
[TRACE] [.c.i.CalDavBindingProviderImpl] - handling config: calendar:cal_holidays type:ACTIVE eventNr:1 value:START
[TRACE] [.c.i.CalDavBindingProviderImpl] - handling config part: calendar:cal_holidays
[TRACE] [.c.i.CalDavBindingProviderImpl] - handling config part: type:ACTIVE
[TRACE] [.c.i.CalDavBindingProviderImpl] - handling config part: eventNr:1
[TRACE] [.c.i.CalDavBindingProviderImpl] - handling config part: value:START
[TRACE] [.c.i.CalDavBindingProviderImpl] - found values: calendar=[cal_holidays], type=ACTIVE, eventNr=1, value=START
[DEBUG] [.c.i.CalDavBindingProviderImpl] - adding item: cal_holiday_time
[DEBUG] [o.o.b.c.internal.CalDavBinding] - setting CalDavLoader: true
[DEBUG] [o.o.b.c.internal.CalDavBinding] - CalDavBinding (personal) activated
[DEBUG] [o.o.b.c.internal.CalDavBinding] - loading configuration…
[DEBUG] [o.o.b.c.internal.CalDavBinding] - loading configuration done
[TRACE] [o.o.b.c.internal.CalDavBinding] - reloading events
[TRACE] [.i.c.internal.CalDavLoaderImpl] - quering events for filter: CalDavQuery [calendarIds=[cal_holidays], from=2016-05-25T22:03:26.414+03:00, to=null, sort=ASCENDING]
[DEBUG] [.i.c.internal.CalDavLoaderImpl] - calendar id cal_holidays not found
[DEBUG] [.i.c.internal.CalDavLoaderImpl] - return event list for CalDavQuery [calendarIds=[cal_holidays], from=2016-05-25T22:03:26.414+03:00, to=null, sort=ASCENDING] with 0 entries
[DEBUG] [o.o.b.c.internal.CalDavBinding] - no event found for cal_holiday_time, setting to UNDEF
[DEBUG] [o.o.b.c.internal.CalDavBinding] - no event found for cal_holiday, setting to UNDEF
[DEBUG] [o.o.b.c.internal.CalDavBinding] - calendar reloaded: cal_holidays
[TRACE] [.i.c.internal.CalDavLoaderImpl] - quering events for filter: CalDavQuery [calendarIds=[cal_holidays], from=2016-05-25T22:03:26.475+03:00, to=null, sort=ASCENDING]
[DEBUG] [.i.c.internal.CalDavLoaderImpl] - calendar id cal_holidays not found
[DEBUG] [.i.c.internal.CalDavLoaderImpl] - return event list for CalDavQuery [calendarIds=[cal_holidays], from=2016-05-25T22:03:26.475+03:00, to=null, sort=ASCENDING] with 0 entries
[DEBUG] [o.o.b.c.internal.CalDavBinding] - no event found for cal_holiday_time, setting to UNDEF
[DEBUG] [o.o.b.c.internal.CalDavBinding] - no event found for cal_holiday, setting to UNDEF

Any ideas?
Thanks!