187: Forbidden URI type for @meta

A line in your document starts with a squirrel @, which marks a metadata declaration. A metadata declaration assigns a value to a metadata name. In your case, the metadata name is meta and its value is a link. The meta metadata name expects a link to a local file, but in your case the link is of a different type, for example a data URI or an absolute URL.

Solution

Use a filepath that starts with a slash / and is relative to the Aneamal root directory or one that is relative to the current directory to link to metadata files:

% this is relative to the Aneamal root:
@ meta: ->/config/mobile.nml

% this is a file in the parent directory
% of the current file's directory:
@ meta: ->../@meta.nml

If you want to use meta as metadata name without the special function it has in Aneamal – although this is discouraged – you can prepend the name with a backslash like this:

@ \meta: ->https://en.wiktionary.org/wiki/meta

If you did not mean to declare metadata, but want to start the line with a literal @, you can prepend a backslash: \@