What is the error in building a WxWidgets app in Visual Studio 2019?

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Without further context or specific error messages, it is impossible to provide a definitive answer. However, some common errors that one may encounter while building a WxWidgets app in Visual Studio 2019 include:

1. Missing or incorrect configurations: Make sure that you have set up the correct build configurations for your project (e.g. Debug, Release), and that you have selected the correct architecture (e.g. x86, x64). You can do this from the Configuration Manager in Visual Studio.

2. Missing include and library files: Ensure that you have properly set up the include and library paths for WxWidgets in your project settings. Make sure that the paths are correctly pointing to the appropriate directories where the header and library files are located.

3. Incorrect linker settings: Make sure that the linker settings for your project are properly set up. This includes specifying the correct output directory, linking against the required libraries, and setting up any additional linker flags.

4. Compiler errors: Check that any code in your project is WxWidgets compatible and free of syntax errors. Make sure you have included any required headers and that you are using the correct macro and naming conventions.

5. DLL issues: If you are using a dynamically linked library (DLL) version of WxWidgets, make sure the DLLs are in the correct location and that your project is set up to correctly link against them.

6. Unsupported WxWidgets version: Verify that you are using a WxWidgets version that is compatible with Visual Studio 2019.

In general, error messages can provide valuable insights into what went wrong during the build process. Be sure to read and understand any error messages that Visual Studio generates and use them to help diagnose and fix any issues with your project.