This content has 1 year. Some of the information in this post may be out of date or no longer work. Please, read this page keeping its age in your mind.Developers working on .NET MAUI projects may encounter a perplexing error during the build process, revealing invalid file names that must adhere to specific rules. The Solution To resolve this issue, developers need to identify and correct the problematic file names. On macOS, the hidden file .DS_Store is a common culprit causing this error. Here’s a step-by-step guide to resolving the issue: For macOS If the Finder app does not show any files, try opening a terminal, navigate to the resources folder of your project, and type ls -la to see the files. It should display the invalid files. Remove them accordingly. For Windows