FileCollector::addFileObject() 

Prompt 

Argument 1 passed to TYPO3CMSFrontendResourceFileCollector::addFileObject() must implement interface TYPO3CMSCoreResourceFileInterface, boolean given, called in .../typo3/sysext/frontend/Classes/Resource/FileCollector.php on line 118

Cause 

Unproper configuration of a relation to a file.

Solution 

Probably the page resource media is linked with a file, which is deleted. Please delete the relation at page resource media.