247: Metadata name not declared with link value
You linked to a file using a combination of arrow and squirrel ->@ which marks a metadata link. ->@ is supposed to be followed by a metadata name to which a link has been assigned in a metadata declaration. The metadata name has been declared in your case, but not with a link as value.
Solution
Make sure that the metadata name after ->@ has been declared with a link as value. This means that there must be an arrow -> before the address in the metadata declaration as well. For example:
@ 1st: ->/photos/victory.jpg
[i:gold medalist]->@1st