diff --git a/plugins/CuraEngineBackend/CuraEngineBackend.py b/plugins/CuraEngineBackend/CuraEngineBackend.py
index c04e4d74f5..9d448e11bb 100644
--- a/plugins/CuraEngineBackend/CuraEngineBackend.py
+++ b/plugins/CuraEngineBackend/CuraEngineBackend.py
@@ -220,6 +220,9 @@ class CuraEngineBackend(Backend):
     #
     #   \param job The start slice job that was just finished.
     def _onStartSliceCompleted(self, job):
+        if self._error_message:
+            self._error_message.hide()
+
         # Note that cancelled slice jobs can still call this method.
         if self._start_slice_job is job:
             self._start_slice_job = None
@@ -258,6 +261,14 @@ class CuraEngineBackend(Backend):
                 self.backendStateChange.emit(BackendState.NotStarted)
             return
 
+        if job.getResult() == StartSliceJob.StartJobResult.BuildPlateError:
+            if Application.getInstance().getPlatformActivity:
+                self._error_message = Message(catalog.i18nc("@info:status", "Unable to slice because the prime tower or prime position(s) are invalid."))
+                self._error_message.show()
+                self.backendStateChange.emit(BackendState.Error)
+            else:
+                self.backendStateChange.emit(BackendState.NotStarted)
+
         if job.getResult() == StartSliceJob.StartJobResult.NothingToSlice:
             if Application.getInstance().getPlatformActivity:
                 self._error_message = Message(catalog.i18nc("@info:status", "Nothing to slice because none of the models fit the build volume. Please scale or rotate models to fit."))
diff --git a/plugins/CuraEngineBackend/StartSliceJob.py b/plugins/CuraEngineBackend/StartSliceJob.py
index b343c307af..0319186518 100644
--- a/plugins/CuraEngineBackend/StartSliceJob.py
+++ b/plugins/CuraEngineBackend/StartSliceJob.py
@@ -25,6 +25,7 @@ class StartJobResult(IntEnum):
     SettingError = 3
     NothingToSlice = 4
     MaterialIncompatible = 5
+    BuildPlateError = 6
 
 
 ##  Formatter class that handles token expansion in start/end gcod
@@ -80,7 +81,7 @@ class StartSliceJob(Job):
             return
 
         if Application.getInstance().getBuildVolume().hasErrors():
-            self.setResult(StartJobResult.SettingError)
+            self.setResult(StartJobResult.BuildPlateError)
             return
 
         for extruder_stack in cura.Settings.ExtruderManager.getInstance().getMachineExtruders(stack.getId()):