Index: wflow/pcrglobwb/virtualOS.py
===================================================================
diff -u -rc427e9b948a7fbad40a1c828b68355cb277dc5e0 -rfc718a28db8654837a5bafe36e9cc92beba110f7
--- wflow/pcrglobwb/virtualOS.py	(.../virtualOS.py)	(revision c427e9b948a7fbad40a1c828b68355cb277dc5e0)
+++ wflow/pcrglobwb/virtualOS.py	(.../virtualOS.py)	(revision fc718a28db8654837a5bafe36e9cc92beba110f7)
@@ -1133,7 +1133,7 @@
         PCRmap = (
             None
         )  # 29 July: I made an experiment by changing the type of this object.
-    elif not re.match(r"[0-9.-]*$", v):
+    elif not re.match(r"[0-9.-]*$", str(v)):
         if absolutePath != None:
             v = getFullPath(v, absolutePath)
         # print(v)