Index: branches/apertium-tagger/experiments/experiments.py
===================================================================
--- branches/apertium-tagger/experiments/experiments.py	(revision 71585)
+++ branches/apertium-tagger/experiments/experiments.py	(revision 71586)
@@ -295,7 +295,7 @@
 @reg('percep')
 @xval_experiment
 def percep_experiment(lab, xval_fns, cg, mtx, **kwargs):
-    mtx_fn = pjoin(MODULE_PATH, 'mtx', + mtx + '.mtx')
+    mtx_fn = pjoin(MODULE_PATH, 'mtx', mtx + '.mtx')
 
     tagger_train_percep(xval_fns['model'],
                         train_fn=xval_fns['train'],