Understanding "the another" mistake: a grammar insight

What kind of error is it?

Grammatical error involving article misuse

Why do people make this mistake?

People might make this error because they confuse when to use "another" versus "the other". "Another" is used to refer to any additional item, while "the other" specifies a particular additional item already mentioned.

What is correct?

The correct phrase depends on the context: use "another" for any additional item in general or use "the other" when referring to the particular item already known.