History of Errors on Scratch Wiki
Errors can occur on the Scratch Wiki due to incomplete or copied wrong code. One of the most common errors occurs when a scratcher tries to insert HTML on the wiki even though some HTML the wiki can't recognize and therefore ignores it or causes an entire page to glitch.
If you have an error...
The best way to solve a wikicode error is to paste it into a sandbox, either the public one or your personal one. Then, create a Community Portal discussion including a link to the broken code. Other Wiki editors will try to help out.