Oops…

Trac detected an internal error:
TypeError: walkchangerevs() takes exactly 4 arguments (5 given)

There was an internal error in Trac. It is recommended that you inform your local Trac administrator and give him all the information he needs to reproduce the issue.

To that end, you could a ticket.

The action that triggered the error was:

GET: /log/java/sql-vyuka/src

TracGuide — The Trac User and Administration Guide