Problems building for flash

This Error given me when i’m Building Project with swf(flash) Format!
please help me! It’s To important for me.
sorry for my bad English!

Assets/Plugins/AstarPathfindingProject/Generators/RecastGenerator.cs(559,33): error CS0246: The type or namespace name `TerrainData’ could not be found. Are you missing a using directive or an assembly reference?

Hi

Building for flash is not supported since it removes too much of .Net. It would be a hell of a job writing replacements for everything (if even possible).
This is also stated on the feature list page:

Multi-platform

Release to about any platform Unity supports (except flash…

Also, please do not name topics “Hi”. A more descriptive title would have been preferred.
[Edit] Updated title to better reflect the contents of the topic.