problem with my site

after the update an error appears on the site and it is inaccessible for the moment here the error message: Argument 1 passed to Troop \ PlaceholderImage \ Html \ Image :: __ construct () must be an instance of Concrete \ Core \ File \ File, instance of Concrete \ Core \ Entity \ File \ File

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MrKDilkington replied on at Permalink Reply
Hi davpyth,

Did you upgrade from 5.7 to v8? If so, the troop Placeholder Images add-on may not support v8.

I recommend creating an add-on support question.