ERROR: The UDF library you are trying to load (libudf) is not compiled for parallel use on the current platform (win64)

This error indicates that you're trying to load a User Defined Function (UDF) library in ANSYS Fluent that wasn't compiled for parallel processing on your 64-bit Windows system (win64).

To fix this, you'll need to recompile the UDF library for parallel use. This typically involves using a compatible compiler like Microsoft Visual Studio with the appropriate parallel processing settings.

Here are some additional points to consider:

 * Consult the ANSYS documentation or online resources for specific instructions on compiling UDFs for parallel processing in your ANSYS Fluent version.

 * You might need to have Microsoft Visual Studio or a similar compiler installed to complete the recompilation process.