diff --git a/schainpy/model/jrodataIO.py b/schainpy/model/jrodataIO.py
index 1159b1c..86c0a7e 100644
--- a/schainpy/model/jrodataIO.py
+++ b/schainpy/model/jrodataIO.py
@@ -1179,7 +1179,7 @@ class VoltageReader(JRODataReader):
     
         self.blocksize = 0
         
-        dataOut = self.createObjByDefault()
+        self.dataOut = self.createObjByDefault()
     
     def createObjByDefault(self):
         
@@ -1776,7 +1776,7 @@ class SpectraReader(JRODataReader):
     
         self.blocksize = 0
         
-        dataOut = self.createObjByDefault()
+        self.dataOut = self.createObjByDefault()
 
 
     def createObjByDefault(self):