When I tried to do a test of "collection" (caiji) feature of DedeCms, my server shows the following error:

Code:

I spent some time trying to find out why, I even dug into server side error logs but did not find useful information. Then I ended up clearing my cookies for this web server and the Internal Server Error 500 was resolved...

I think the cookies/sessions messed up in the process of caiji process.