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One alternative solution could be to make sure that the MongoDB driver is properly installed and imported in the project. This can be done by running the command "npm install mongodb" in the command prompt or terminal, and then adding the line "const MongoClient = require('mongodb').MongoClient" at the top of the relevant file where the MongoClient is being used. If this does not work, checking for any syntax errors or spelling mistakes in the code may also be helpful.