Board Thread:Support Requests - Getting Technical/@comment-3545520-20130309172842/@comment-957747-20130310000145

Here's the scenario:

You're converting knots to miles. The template is called similar to kn mph (150knots => ??mph). undefined undefined then loads up the template. If that template doesn't exist, it evaluates it to NULL, in which it ends up loading (which is wrong).

There is a conversion somewhere along the line in each line that is giving errors that is missing the relevant template. Those templates need to be in place or it can cause evaluation errors (numbers missing where they should be/are expected to be).

Template:Convert is one of the most complex set of templates on Wikipedia... it honestly might be easier to, instead of copy/pasting something Wikipedia has done, to create what you need instead of most of the fallbacks/failsafes that Wikipedia has built in.