Error 404

Error 404 is the name given to a series of glitches and anomalies that can cause severe damage to the save file, the game, or the cartridge itself, all of which have a strange crash handler appear at the end of the anomaly that only say "Error 404". It is not entirely known why these errors occur, but they were first reported after the MIPS Hole wiki reached 404 pages, implying some relevancy.

Complete Data Wipe
A Complete Data Wipe is an error that can seemingly happen at any point, causing the 404 crash handler to appear. When restarting the game, all save files will lose all data. If the player starts a new save file, several anomalies will appear much more aggressive and unstable, potentially causing more instances of Error 404 anomalies.

Deathpipe
The Deathpipe anomaly occurs where a warp pipe can suddenly appear somewhere in the game. Upon entering it, the Error 404 crash handler will appear, and a Complete Data Wipe can also occur. Deathpipes can notably reportedly be red, appearing to indicate their existence unless red warp pipes exist elsewhere.

Disconnected Crash Handler Manifestations
Strangely, the Error 404 crash handler can appear without any other prompting. This is separate from Complete Data Wipes as no other anomalous activity occurs after the crash handler appears and the game is reset.

False Interfaces
False Interfaces occur when anomalous GUIs and interfaces, such as the Painting Creator, appear, though upon leaving the interface, the signature 404 Crash Handler will appear. These False Interfaces are very rare, though appear to have no malevolent affect besides the game crashing and potential save file corruption.

Theorizing
These errors appear to be potentially unrelated anomalies that are not entirely stable or finished by the Personalization A.I., causing the Error 404 crash handler to appear. The crash handler itself appears to potentially be unfinished as well due to the lack of text, and later scrapped when it was unneeded in the retail release. The correlation to the MIPS Hole wiki page count is also still unsolved, though the fact the crash handler says Error 404 and the anomalies began to appear after the 404th page was made appear to indicate this supposed correlation.