In the sentence "I am way behind at work, so I think I will just dissappear under this mountain of files until Wednesday," what is the error?

The error in the sentence is indeed the spelling of "disappear." The correct spelling includes two "a's" following the "s," which reflects the proper form of the word that means to cease to be visible or to vanish. In this case, "dissappear" is a misspelling, which can distract from the overall clarity of the sentence. Ensuring the accuracy of spellings helps maintain professionalism and credibility in writing, especially in a work context.