I am getting the following error when I try to build the widgetset using the build/build.xml ANT script .
BUILD FAILED
C:\ThuyWorks\workspace\vaadin\build\build.xml:886: Execute failed: java.io.IOException: Cannot run program “svn” (in directory “C:\ThuyWorks\workspace\vaadin\build\checkout”): CreateProcess error=2, The system cannot find the file specified
As it says, Subversion (svn) is not installed in your system.
What build.xml are we talking about, exactly? Vaadin installation package does not include a build.xml, nor does the Eclipse plugin create one. I assume that you are trying to compile Vaadin itself from the sources. The build process called Subversion earlier, but that was changed, so you must be trying to compile from old sources.