21 Days error

The program gives a long syntax error message with error number 2146827286 when you switch to 21 days in the options section

I suppose there is an event in your agenda between 14 and 21 days which causes the error (because it works for example for me).

There is a logfile named "Google Calendar Agenda" in your user temp directory (normally c:\users\%username%\appdata\local\temp\). Would you please send me that file in email so that I can investigate the issue?