HeightSpec="Full" - TypeError: $h is undefined

Hi,

I work on a project which use the calendar.
It works well with HeightSpec="BusinessHoursNoScroll" property.
But when it doesn't works with HeightSpec="Full" and I have a javascript error :
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TypeError: $h is undefined

DayPilot.Calendar/this.$6H()
DayPilot.Calendar/this.$6B()
DayPilot.Calendar/this.$50()
DayPilot.Calendar/this.$4C()

WebForm_ExecuteCallback()
WebForm_CallbackComplete()
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Any idea what it could be ?

Best regards.