There’re two problems here.
The “failed items” dialog is missing a slash between the folder path and the failed item - it’s trying to say the failed item is C:\Users\xavier\Documents\ALVEOLES ARCHITECTURE\Icon. This is cosmetic and fixed in 0.14.29.
The real problem is that the file is actually called Icon\r (i.e., “Icon” followed by a newline) which is not a valid filename on Windows. You can ignore this file by adding the following ignore patterns, preferably on both sides:
!Icon[a-z0-9_-]
(?d)Icon?
This means do not ignore files called Icon followed by letter, number, underscore or dash, ignore files called Icon followed by any other character and delete them if they are in the way. This whole dance is needed because it’s not possible to express the \r character directly in the ignore file.