The underlined portion "Una la computadora" is incorrect because the article "una" (which means "a" or "one" in English) should not be used with "la" (which means "the" in English). In Spanish, you must choose either the indefinite article "una" or the definite article "la," but not both together.
To correct the sentence, you can say either "Una computadora está en mi mochila" (A computer is in my backpack) or "La computadora está en mi mochila" (The computer is in my backpack), depending on whether you are talking about a specific computer or any computer in general.
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