Startup failed

Tiny Tiny RSS was unable to start properly. This usually means a misconfiguration or an incomplete upgrade. Please fix errors indicated by the following messages:

PHP UConverter class is missing, it's provided by the Internationalization (intl) module.
PHP support for DOMDocument is required, but was not found.

You might want to check tt-rss wiki or the forums for more information. Please search the forums before creating new topic for your question.