Cannot create new events

[ilieandriuta]

Environment: Windows 10 Pro 64 bit, Firefox 83, using a local instance XWiki 12.9 on Oracle 19c, Calendar Pro 2.9

STEPS TO REPRODUCE

1. Go to Calendar Pro App
2. Click 'Create new event'

EXPECTED RESULTS

The new event box opens and an event title can be added.

ACTUAL RESULTS

The new event box opens, but contains an error in it:

Failed to execute the [velocity] macro. Cause: [Encountered "}" at xwiki:MoccaCalendar.MoccaCalendarEventSheet[line 13, column 79] Was expecting one of: "[" ... "||" ... "," ... ")" ... <WHITESPACE> ... <NEWLINE> ... "-" ... "+" ... "*" ... "/" ... "%" ... <LOGICAL_AND> ... <LOGICAL_OR> ... <LOGICAL_LT> ... <LOGICAL_LE> ... <LOGICAL_GT> ... <LOGICAL_GE> ... <LOGICAL_EQUALS> ... <LOGICAL_NOT_EQUALS> ... ]. Click on this message for details.

Also, in XWiki console there is the following error:

2020-11-18 14:25:45,274 [http-nio-1115-exec-9 - http://localhost:1115/xwiki/bin/edit/MoccaCalendar/randomPageHbebLNVCyP?template=MoccaCalendar.MoccaCalendarEventTemplate&parentFROM=MoccaCalendar.Events&form_token=tv3bb0JD5mxOJoxkAAVFVg&ocalcaction=create&xpage=plain&xhidden=1] ERROR o.a.v.parser                   - xwiki:MoccaCalendar.MoccaCalendarEventSheet: Encountered "}" at line 13, column 79.
Was expecting one of:
    "[" ...
    "||" ...
    "," ...
    ")" ...
    <WHITESPACE> ...
    <NEWLINE> ...
    "-" ...
    "+" ...
    "*" ...
    "/" ...
    "%" ...
    <LOGICAL_AND> ...
    <LOGICAL_OR> ...
    <LOGICAL_LT> ...
    <LOGICAL_LE> ...
    <LOGICAL_GT> ...
    <LOGICAL_GE> ...
    <LOGICAL_EQUALS> ...
    <LOGICAL_NOT_EQUALS> ...

Nothing happens if the 'Save' button is clicked.