This post attempts to explain an issue when working with Femap and Nastran that might be helpful. If you have landed on this page from a search, then you have likely received the following message from Simcenter Nastran via Femap or by inspecting the f06 file on a failed solution…
![Nastran Fatal: Preprocessor Control Validation Failed Nastran Fatal: Preprocessor Control Validation Failed](https://www.learningfea.com/wp-content/uploads/2020/12/splashscreen2021-670x300.png)