diff --git a/ImportAtlas/ImportAtlas.py b/ImportAtlas/ImportAtlas.py
index 6e6d25c..aee96bd 100644
--- a/ImportAtlas/ImportAtlas.py
+++ b/ImportAtlas/ImportAtlas.py
@@ -384,6 +384,9 @@ def __init__(self, atlasPath):
         structure = FibersStructure()
       elif pixdimType == 'discfibers':
         structure = DiscFibersStructure()
+      if isinstance(structure, FibersStructure) and not hasattr(slicer.modules,'tractographydisplay'):
+        qt.QMessageBox().warning(qt.QWidget(), "Error", "Install SlicerDMRI Extension to load fiber atlases")
+        continue
       structure.atlasPath = atlasPath
       structure.index = i
       structure.name = names[i]