On page => https://www.mediawiki.org/wiki/API:Imageinfo#Possible_errors I noticed following points:
1. The two following wordings have no error code specified :
| ? || Invalid value for iiurlparam (name=value).
| ? || Could not normalize image parameters for $1.
How do we research these error codes to make the assignment with the given text ?
2.reference to deleted page; what to understand ?
iibadfilecontexttitle uses reference to page 'MediaWiki:Bad image list' in text :
Adds whether the file is on the MediaWiki:Bad image list
but page MediaWiki:Bad image list is https://www.mediawiki.org/wiki/MediaWiki:Bad_image_list and has been deleted :
13:41, 7 January 2007 MediaWiki default talk contribs deleted page MediaWiki:Bad image list (No longer required)
3. API:Fileinfo at bottom is a red link