Path Argument Error When Using webpack With less-loader

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I'm currently in the process of trying to upgrade the version of webpack in an old Angular project, which doesn't use the Angular CLI. I made the necessary modifications to upgrade from version 3 to version 4, but was getting the following error with less-loader:

(node:672) UnhandledPromiseRejectionWarning: TypeError [ERR_INVALID_ARG_TYPE]: The "path" argument must be of type string. Received type undefined
    at validateString (internal/validators.js:112:11)
    at Object.normalize (path.js:266:5)
    at new LessError (C:\DevGit\MyOrg.Portal\MyOrg.Portal.Mvc\Resources\ng\node_modules\less-loader\dist\LessError.js:15:169)
    at C:\DevGit\MyOrg.Portal\MyOrg.Portal.Mvc\Resources\ng\node_modules\less-loader\dist\index.js:62:14

This had me tweaking the webpack config endlessly, until finding out that this is apparently an issue in less-loader v6. When I downgraded to v5.0.0, the problem went away...leaving me with the next problem to troubleshoot. Baby steps! One down, at least one more to go...

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