Can't install the extension builder

[gfranz]

I get the following error when I try to install it on an empty Railo Express and on my local latest Railo 4.1.1.002:

Environment is:
Windows 7 64bit
Railo 4.1.1.002
Resin 4.0

Railo 4.1.1.002 Error (expression)
Message variable [DESTFILE] doesn't exist
Stacktrace The Error Occurred in
Java Stacktrace variable [DESTFILE] doesn't exist
at railo.runtime.type.scope.UndefinedImpl.get(UndefinedImpl.java:203):203
at admin.extension_applications_install2_cfm1518$cf.call(F:\Workspace\git\igal-getrailo\railo-cfml\railo-admin\admin\extension.applications.install2.cfm:53):53
at railo.runtime.PageContextImpl.doInclude(PageContextImpl.java:811):811
at railo.runtime.PageContextImpl.doInclude(PageContextImpl.java:787):787
at admin.extension_applications_cfm460$cf.call(F:\Workspace\git\igal-getrailo\railo-cfml\railo-admin\admin\extension.applications.cfm:72):72
at railo.runtime.PageContextImpl.doInclude(PageContextImpl.java:811):811
at railo.runtime.PageContextImpl.doInclude(PageContextImpl.java:787):787
at admin.web_cfm$cf.call(F:\Workspace\git\igal-getrailo\railo-cfml\railo-admin\admin\web.cfm:377):377
at railo.runtime.PageContextImpl.doInclude(PageContextImpl.java:811):811
at railo.runtime.PageContextImpl.doInclude(PageContextImpl.java:792):792
at railo.runtime.listener.ModernAppListener._onRequest(ModernAppListener.java:191):191
at railo.runtime.listener.ModernAppListener.onRequest(ModernAppListener.java:79):79
at railo.runtime.PageContextImpl.execute(PageContextImpl.java:2156):2156
at railo.runtime.PageContextImpl.execute(PageContextImpl.java:2123):2123
at railo.runtime.engine.CFMLEngineImpl.serviceCFML(CFMLEngineImpl.java:318):318
at railo.loader.servlet.CFMLServlet.service(CFMLServlet.java:29):29
at javax.servlet.http.HttpServlet.service(HttpServlet.java:96):96
at com.caucho.server.dispatch.ServletFilterChain.doFilter(ServletFilterChain.java:109):109
at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:156):156
at com.caucho.server.webapp.AccessLogFilterChain.doFilter(AccessLogFilterChain.java:95):95
at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:289):289
at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:811):811
at com.caucho.network.listen.TcpSocketLink.dispatchRequest(TcpSocketLink.java:1203):1203
at com.caucho.network.listen.TcpSocketLink.handleRequest(TcpSocketLink.java:1164):1164
at com.caucho.network.listen.TcpSocketLink.handleRequestsImpl(TcpSocketLink.java:1148):1148
at com.caucho.network.listen.TcpSocketLink.handleRequests(TcpSocketLink.java:1071):1071
at com.caucho.network.listen.TcpSocketLink.handleAcceptTask(TcpSocketLink.java:907):907
at com.caucho.network.listen.AcceptTask.doTask(AcceptTask.java:74):74
at com.caucho.network.listen.ConnectionTask.runThread(ConnectionTask.java:97):97
at com.caucho.network.listen.ConnectionTask.run(ConnectionTask.java:80):80
at com.caucho.network.listen.AcceptTask.run(AcceptTask.java:59):59
at com.caucho.env.thread.ResinThread.runTasks(ResinThread.java:164):164
at com.caucho.env.thread.ResinThread.run(ResinThread.java:130):130