Index: main/maven-plugin/src/main/java/hudson/maven/MavenModuleSet.java
===================================================================
--- main/maven-plugin/src/main/java/hudson/maven/MavenModuleSet.java	(revision 23596)
+++ main/maven-plugin/src/main/java/hudson/maven/MavenModuleSet.java	(working copy)
@@ -709,7 +709,7 @@
     public FormValidation doCheckFileInWorkspace(@QueryParameter String value) throws IOException, ServletException {
         MavenModuleSetBuild lb = getLastBuild();
         if (lb!=null) {
-            FilePath ws = lb.getModuleRoot();
+            FilePath ws = lb.getWorkspace();
             if(ws!=null)
                 return ws.validateRelativePath(value,true,true);
         }
@@ -731,7 +731,7 @@
         
         MavenModuleSetBuild lb = getLastBuild();
         if (lb!=null) {
-            FilePath ws = lb.getModuleRoot();
+            FilePath ws = lb.getWorkspace();
             if(ws!=null)
                 return ws.validateRelativePath(value,true,true);
         }