Uncaught TypeError: Cannot read properties of undefined (reading 'firstChild')
    at init._createItemsData (calendar.wpd:3100:19)
    at init.bind_ (calendar.wpd:3075:26)
    at init.bindChildren_ (zk.wpd:23563:67)
    at init.bind_ (zk.wpd:23523:12)
    at init.bind (zk.wpd:23440:14)
    at init.replaceChildHTML_ (zk.wpd:23147:13)
    at init.replaceHTML (zk.wpd:22972:16)
    at mtBL0 (zk.wpd:27390:13)
    at mtBL (zk.wpd:27356:5)
    at doEnd (zk.wpd:26748:7)