Error saving topic

After installing the latest extension updates, saving a topic (new or existing) ended in two errors:

• Error saving topic: During save of … an error was found by the version control system.
  Operation save failed with an internal error
  Go back in your browser and save your changes locally
• Warning! Confirmation required
  Foswiki has received a suspicious change request from your browser. There is a risk that someone may be trying to use your identity to change content on Foswiki without your knowledge.
  - Press OK to confirm that this change was intentional.
  - Press cancel otherwise.

Apparently, two updated extensions required the Time/ParseDate CPAN module, the DBCacheContrib and the DBCachePlugin extensions.

After adding the Time::ParseDate module to the foswiki/lib/CPAN/lib directory, the problem was solved.