diff --git a/org.eclipse.titan.designer/src/org/eclipse/titan/designer/application/ImportProject.java b/org.eclipse.titan.designer/src/org/eclipse/titan/designer/application/ImportProject.java
index efc4f135eb60f5ca040219cc1222956724af78f7..c2f96556f6f5296641254c1c0e88a0b9f433c057 100644
--- a/org.eclipse.titan.designer/src/org/eclipse/titan/designer/application/ImportProject.java
+++ b/org.eclipse.titan.designer/src/org/eclipse/titan/designer/application/ImportProject.java
@@ -57,8 +57,10 @@ public final class ImportProject implements IApplication {
 		}
 		try {
 			final IProject project = TITANProjectOpener.open(projectPath);
-			if (!TITANProjectOpener.check(project)) {
-				System.out.println("The project with name `" + project.getName() + "' is imported, but it is not a Titan project.");
+			if (TITANProjectOpener.check(project)) {
+				System.out.println("The project with name `" + project.getName() + "' is imported in the workspace!");
+			} else {
+				System.out.println("The project with name `" + project.getName() + "' is imported in the workspace, but it is not a Titan project.");
 			}
 		} catch (Exception e) {
 			ErrorReporter.logExceptionStackTrace("Error while imporing project with name `"
diff --git a/org.eclipse.titan.designer/src/org/eclipse/titan/designer/application/InvokeBuild.java b/org.eclipse.titan.designer/src/org/eclipse/titan/designer/application/InvokeBuild.java
index f844f0f97294e96bc0582d6cbdb25a7a6fc4a481..3890e102c1e8915a376374be3f9dbb92d99969fb 100644
--- a/org.eclipse.titan.designer/src/org/eclipse/titan/designer/application/InvokeBuild.java
+++ b/org.eclipse.titan.designer/src/org/eclipse/titan/designer/application/InvokeBuild.java
@@ -55,13 +55,13 @@ public final class InvokeBuild implements IApplication {
 				MakefileCreationData.DEFAULT_JAVA_TARGET_PROPERTY), MakefileCreationData.DefaultJavaTarget.EXECUTABLE.toString());
 		project.setPersistentProperty(new QualifiedName(ProjectBuildPropertyData.QUALIFIER,
 				MakefileCreationData.GENERATE_START_SH_SCRIPT_PROPERTY), String.valueOf(true));
-		if (AntScriptGenerator.generateAndStoreBuildXML(project, true)) {
+		if (AntScriptGenerator.generateAndStoreBuildXML(project, false)) {
 			AntLaunchConfigGenerator.createAntLaunchConfiguration(project);
 			AntLaunchConfigGenerator.addAntBuilder(project);
+			AntLaunchConfigGenerator.setAntBuilderEnabled(project, true);
+			CliScriptGenerator.generateAndStoreScripts(project);
 			project.refreshLocal(IResource.DEPTH_ONE, null);
 		}
-		CliScriptGenerator.generateAndStoreScripts(project);
-		AntLaunchConfigGenerator.setAntBuilderEnabled(project, true);
 	}
 
 	private Integer closeWorkspace() {
diff --git a/org.eclipse.titan.designer/src/org/eclipse/titan/designer/core/ant/AntScriptGenerator.java b/org.eclipse.titan.designer/src/org/eclipse/titan/designer/core/ant/AntScriptGenerator.java
index 31f988ed014e9cbd38a95f15ff6611a385cb2150..b0d0819ead7e8de60242bd6926affc8d246cc551 100644
--- a/org.eclipse.titan.designer/src/org/eclipse/titan/designer/core/ant/AntScriptGenerator.java
+++ b/org.eclipse.titan.designer/src/org/eclipse/titan/designer/core/ant/AntScriptGenerator.java
@@ -242,6 +242,12 @@ public final class AntScriptGenerator {
 			return null;
 		}
 		final SourceInfo[] sourceInfos = convert(getClasspath(config));
+		if (sourceInfos == null || sourceInfos.length == 0) {
+			ErrorReporter.parallelErrorDisplayInMessageDialog(
+					"Error while generating the ANT script 'jarbuild.xml' for project",
+					"Error while resolving classpaths!");
+			return null;
+		}
 		JavaAppLaunchConfigGenerator.deleteTemporaryJavaAppLaunchConfiguration(project);
 		DocumentBuilder docBuilder = null;
 		DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
diff --git a/org.eclipse.titan.designer/src/org/eclipse/titan/designer/wizards/TITANProjectOpener.java b/org.eclipse.titan.designer/src/org/eclipse/titan/designer/wizards/TITANProjectOpener.java
index 34f27cbea449b40d4330927f2afbbe7561b80eff..7e8f0671fbc0a53a85112c593c06409404b4a9c6 100644
--- a/org.eclipse.titan.designer/src/org/eclipse/titan/designer/wizards/TITANProjectOpener.java
+++ b/org.eclipse.titan.designer/src/org/eclipse/titan/designer/wizards/TITANProjectOpener.java
@@ -52,7 +52,7 @@ public final class TITANProjectOpener {
 	 * @return If a project with the same name already exists in the workspace then the handler of this project
 	 *         is returned, otherwise the project on the specified path is created in the workspace.
 	 *         {@code null} is returned upon empty or null path
-	 * @throws CoreException
+	 * @throws CoreException, FileNotFoundException
 	 */
 	public static IProject open(final IPath path) throws CoreException, FileNotFoundException {
 		if (path == null || path.isEmpty()) {
@@ -93,7 +93,7 @@ public final class TITANProjectOpener {
 	 * @return If a project with the same name already exists in the workspace then the handler of this project
 	 *         is returned, otherwise the project on the specified path is created in the workspace.
 	 *         {@code null} is returned upon empty or null path
-	 * @throws CoreException
+	 * @throws CoreException, FileNotFoundException
 	 */
 	public static IProject open(final String pathString) throws CoreException, FileNotFoundException {
 		return open(new Path(pathString));