Seems to be a problem with datepicker?
I just can't figure it out...
Error: TypeError: jQuery(...).datepick is not a function
and thats why the calendar is not showing.
Try to deactivate one by one the active plugins, to check if some one is generated that issue.
If its not help try to deactivate the actual theme and activate the default one and then test it again.
Please check the some other troubleshooting instructions here
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