Index: wflow/JarvisCoefficients.py
===================================================================
diff -u -rf215675cc1a3820198cc622db77b70668f4e83b9 -r79870c854312d1769d6934773180c31f3ab16248
--- wflow/JarvisCoefficients.py	(.../JarvisCoefficients.py)	(revision f215675cc1a3820198cc622db77b70668f4e83b9)
+++ wflow/JarvisCoefficients.py	(.../JarvisCoefficients.py)	(revision 79870c854312d1769d6934773180c31f3ab16248)
@@ -276,8 +276,8 @@
     - 
     """
 
-    # teller = numpy.nanmax(pcr.pcr2numpy(self.thestep,nan))
-    teller = pcr.pcr2numpy(self.thestep, nan)[0, 0]
+    # teller = numpy.nanmax(pcr.pcr2numpy(self.thestep,np.nan))
+    teller = pcr.pcr2numpy(self.thestep, np.nan)[0, 0]
     x = teller - floor(teller / 24) * 24 * pcr.scalar(self.catchArea)
     DL = self.DE - self.DS + 1
     P = 2 * pi / (2 * DL)  # period
@@ -309,7 +309,7 @@
     - 
     """
 
-    teller = pcr.pcr2numpy(self.thestep, nan)[0, 0]
+    teller = pcr.pcr2numpy(self.thestep, np.nan)[0, 0]
     x = teller - floor(teller / 24) * 24 * pcr.scalar(self.catchArea)
     DL = self.DE - self.DS + 1
     P = 2 * pi / (2 * DL)  # period