229: Metadata name expected after ->@
You have linked to a file with a combination of arrow and squirrel ->@ which marks a metadata link and is expected to be followed by a metadata name. But ->@ is not followed by a metadata name in your case.
Solution
Make sure the ->@ is directly followed by a metdata name that was declared with a link as value as in the following example:
@ Powell: ->/photos/bear-park/20190503-496.jpg
[i:A sloth bear sniffs for termites.]->@PowellIf you want to create a regular link to a file whose name is an @ sign – whatever that might be good for –, you can prepend it with a backslash ->\@ or enclose it in backticks: ->`@`
If you did not mean to create a link to a file at all, you can also prepend a backslash to the arrow: \->\@