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The problem with reading CSV files in Nest.js that results in Nest being unable to resolve dependencies is that CSV files are not recognized as modules by the TypeScript compiler, which is used by Nest.js. Therefore, Nest.js cannot import or use CSV files as modules, leading to dependencies that cannot be resolved. To fix this issue, you can use a package like csv-parser to parse the CSV file into a JavaScript array or object, which can then be used as a module in your Nest.js application. Alternatively, you can convert the CSV file to a JSON file, which can be used as a module in Nest.js without any issues.