diff --git a/pyren3/doc_maker.py b/pyren3/doc_maker.py
index 8d495a6..371d19e 100755
--- a/pyren3/doc_maker.py
+++ b/pyren3/doc_maker.py
@@ -553,7 +553,12 @@ def generateHTML(path, mtc, vin, dfg, date_madc ):
 
   global style
   
-  lf = os.listdir(path)
+  try:
+    lf = os.listdir(path)
+  except:
+    print("ERROR: path not found: ", path)
+    exit()
+    
   doc = et.Element('html')
   h_h = et.SubElement(doc,'head')
   h_b = et.SubElement(doc,'body')
diff --git a/pyren3/mod_mtc.py b/pyren3/mod_mtc.py
index 3f88262..1f7e151 100644
--- a/pyren3/mod_mtc.py
+++ b/pyren3/mod_mtc.py
@@ -68,14 +68,14 @@ def acf_buildFull( platf ):
       return
 
   mtc = {}
-  mtcf = open(plDIR+'/MTC.dat', 'rb')
+  mtcf = open(plDIR+'/MTC.dat', 'rt')
   mtc_list = csv.reader(mtcf, delimiter=';')
   for i in mtc_list:
     if i:
       mtc[int(i[0][:-4])] = i[1:]
 
   ref = {}
-  reff = open(plDIR+'/REF.dat', 'rb')
+  reff = open(plDIR+'/REF.dat', 'rt')
   ref_list = csv.reader(reff, delimiter=';')
   for i in ref_list:
     if i:
@@ -104,7 +104,7 @@ def acf_buildFull( platf ):
               VIN2 = i.split('.')[0]
               print('   '+VIN2)
               zf=zip.open(i)
-              vin3list=zf.read()
+              vin3list=str(zf.read())
               zf.close()
               for l in vin3list.split('\n'):
                   l = l.strip()