diff --git a/src/plugins/simulator/xplane/simulatorxplane.cpp b/src/plugins/simulator/xplane/simulatorxplane.cpp
index 638c817d1..4ae557dd6 100644
--- a/src/plugins/simulator/xplane/simulatorxplane.cpp
+++ b/src/plugins/simulator/xplane/simulatorxplane.cpp
@@ -595,7 +595,11 @@ namespace BlackSimPlugin
             {
                 if (CDirectoryUtils::isSameOrSubDirectoryOf(package, simDir))
                 {
-                    m_trafficProxy->loadPlanesPackage(package);
+                    const QString message = m_trafficProxy->loadPlanesPackage(package);
+                    if (!message.isEmpty())
+                    {
+                        CLogMessage(this).validationError(u"CSL package '%1' xpmp error: %2") << package << message;
+                    }
                 }
                 else
                 {
diff --git a/src/plugins/simulator/xplane/xswiftbustrafficproxy.cpp b/src/plugins/simulator/xplane/xswiftbustrafficproxy.cpp
index c475df6c5..73a5f1757 100644
--- a/src/plugins/simulator/xplane/xswiftbustrafficproxy.cpp
+++ b/src/plugins/simulator/xplane/xswiftbustrafficproxy.cpp
@@ -64,9 +64,9 @@ namespace BlackSimPlugin
             m_dbusInterface->callDBus(QLatin1String("cleanup"));
         }
 
-        bool CXSwiftBusTrafficProxy::loadPlanesPackage(const QString &path)
+        QString CXSwiftBusTrafficProxy::loadPlanesPackage(const QString &path)
         {
-            return m_dbusInterface->callDBusRet<bool>(QLatin1String("loadPlanesPackage"), path);
+            return m_dbusInterface->callDBusRet<QString>(QLatin1String("loadPlanesPackage"), path);
         }
 
         void CXSwiftBusTrafficProxy::setDefaultIcao(const QString &defaultIcao)
diff --git a/src/plugins/simulator/xplane/xswiftbustrafficproxy.h b/src/plugins/simulator/xplane/xswiftbustrafficproxy.h
index 5a954a446..acd97d221 100644
--- a/src/plugins/simulator/xplane/xswiftbustrafficproxy.h
+++ b/src/plugins/simulator/xplane/xswiftbustrafficproxy.h
@@ -163,7 +163,7 @@ namespace BlackSimPlugin
             void cleanup();
 
             //! \copydoc XSwiftBus::CTraffic::loadPlanesPackage
-            bool loadPlanesPackage(const QString &path);
+            QString loadPlanesPackage(const QString &path);
 
             //! \copydoc XSwiftBus::CTraffic::setDefaultIcao
             void setDefaultIcao(const QString &defaultIcao);
diff --git a/src/xswiftbus/traffic.cpp b/src/xswiftbus/traffic.cpp
index d39bf7cf3..edd602e38 100644
--- a/src/xswiftbus/traffic.cpp
+++ b/src/xswiftbus/traffic.cpp
@@ -226,7 +226,7 @@ namespace XSwiftBus
         return def;
     }
 
-    bool CTraffic::loadPlanesPackage(const std::string &path)
+    std::string CTraffic::loadPlanesPackage(const std::string &path)
     {
         initXPlanePath();
         auto dir = g_xplanePath + "Resources" + g_sep + "plugins" + g_sep + "xswiftbus" + g_sep + "LegacyData" + g_sep;
@@ -234,8 +234,8 @@ namespace XSwiftBus
         std::string related = dir + "related.txt";
         std::string doc8643 = dir + "Doc8643.txt";
         auto err = XPMPLoadCSLPackage(path.c_str(), related.c_str(), doc8643.c_str());
-        if (*err) { return false; }
-        return true;
+        if (*err) { return err; }
+        return {};
     }
 
     void CTraffic::setDefaultIcao(const std::string &defaultIcao)
diff --git a/src/xswiftbus/traffic.h b/src/xswiftbus/traffic.h
index 4bdccb6a5..6f2da7f31 100644
--- a/src/xswiftbus/traffic.h
+++ b/src/xswiftbus/traffic.h
@@ -70,8 +70,8 @@ namespace XSwiftBus
         //! Reverse the actions of initialize().
         void cleanup();
 
-        //! Load a collection of planes from the given directory and return true if successful
-        bool loadPlanesPackage(const std::string &path);
+        //! Load a collection of planes from the given directory and return error message if unsuccessful
+        std::string loadPlanesPackage(const std::string &path);
 
         //! Set the ICAO code to use for aircraft without a model match
         void setDefaultIcao(const std::string &defaultIcao);