[Plugin: Agenda] Fatal error: Class 'FileReader' not found in

Dear forummembers,

I can’t get this agenda plugin to work. Installing goes perfect. I see the added events button @ the posts- and settingssection but when I click on one of these two options I see the following error:

“Fatal error: Class ‘FileReader’ not found in C:\Users\silvershadow\Documents\My Projects\xampp\htdocs\kranck\wp-content\plugins\agenda\agenda.php on line 21”

Could someone give me a solution for this error, please?

Thanks in advance!