Fatal error - Class 'context_condition_node' in date_context module
It means this module is missing or registry is broken.

Can you check if the date module does exist?

If not you may try to download a copy of date module and put it in the exactly the folder.

Use Drush drush cc all to clear the cache.

In Drupal 7 you can also go to admin performance page to clear the cache. Sometimes this is still available by admin/config/development/performance.

If it still does not work, you may want to have a go with registry_rebuild module to rebuild the registry totally.