Need help with "Unable to parse source" error

[kingstolas]

I have a Java SE 17 project with WindowBuilder installed. I followed all the instructional videos on how to install JCalendar, but when I try to use it in any JFrame, these errors appear. I haven't found anything useful yet. Thanks.

[ptziegler]

I assume you're talking about #811 and #698?

Can you check whether you have a module-info.java in your project and whether it contains jcalendar as required module?
#811 (comment)

[kingstolas]

I hadn't noticed that those posts were about the same issue. I've now correctly added JCalendar as a required module, and the error is fixed. Thank you very much! :)