134: Metadata name after @ not declared
The squirrel @ marks metadata in the text and is required to be followed by a metadata name which has been declared in a metadata declaration. However, @ is not followed by a declared metadata name in your case.
Solution
Make sure the @ is immediately succeeded by a declared metadata name like in the following example:
@ author: Jane Doe
This excerpt was written by @author in 2017.You can also enclose the metadata name in backticks to separate it from other characters like the ellipsis in the next example:
This excerpt was written by @`author`…If you did not mean to use metadata within the text, but want to use a literal @ for example in an e-mail address, you can prepend a backslash: \@