We are receiving the below exceptions continously in production but we dont have differenct calendars created with same time zone.  

Type    com.pega.pegarules.pub.PRRuntimeException

Message    Multiple timezones not supported for one calendar

Stack     at com.pega.pegarules.priv.businessCalendar.BusinessCalendar.setTimeZone(BusinessCalendar.java:251) at com.pega.pegarules.priv.businessCalendar.CalendarUtility.updateCalendarCache(CalendarUtility.java:707) at com.pega.pegarules.priv.businessCalendar.CalendarUtility.loadCalendarCache(CalendarUtility.java:258) at com.pega.pegarules.priv.businessCalendar.CalendarUtility.loadCalenderIntoEngineCache(CalendarUtility.java:324) at com.pega.pegarules.priv.businessCalendar.CalendarUtility.checkCalendarCache(CalendarUtility.java:308) at com.pegarules.generated.checkCalendarCache_080601_7623941780283079296.checkCalendarCache08_06_01(checkCalendarCache_080601_7623941780283079296.java:114) at com.pegarules.generated.checkCalendarCache_080601_7623941780283079296.invoke(checkCalendarCache_080601_7623941780283079296.java:73) at com.pega.pegarules.generation.internal.library.LibraryRuntime.resolveAndinvokeFunctionViaReflection(LibraryRuntime.java:238) at com.pega.pegarules.generation.internal.library.LibraryRuntime.invokeLibraryRuntime(LibraryRuntime.java:125) at com.pega.pegarules.session.internal.mgmt.Executable.invokeLibraryRuntime(Executable.java:9821) at com.pega.pegarules.priv.generator.LibrarySupport.resolveAndInvokeFunctionViaReflectionWithException(LibrarySupport.java:277) at com.pegarules.generated.isBusinessDay_080101__2913524803895191054.isBusinessDay08_01_01(isBusinessDay_080101__2913524803895191054.java:121) at com.pegarules.generated.isBusinessDay_080101__2913524803895191054.invoke(isBusinessDay_080101__2913524803895191054.java:73) at com.pega.pegarules.generation.internal.library.LibraryRuntime.resolveAndinvokeFunctionViaReflection(LibraryRuntime.java:238) at com.pega.pegarules.generation.internal.library.LibraryRuntime.invokeLibraryRuntime(LibraryRuntime.java:125) at com.pega.pegarules.generation.internal.library.LibraryFunctionUtilityImpl.resolveMethodCall(LibraryFunctionUtilityImpl.java:2937) at com.pega.pegarules.session.internal.mgmt.Executable.resolveMethodCall(Executable.java:12082)