Fixes NameError in annotation except statement MIT-LCP#253

Lucas-Mc · Lucas-Mc · commit 110b02f32d6d · 2020-09-29T15:14:10.000-04:00
Fixes the NameError that occurs when incorrect return_label_elements are provided while trying to read an annotation file. Fixes MIT-LCP#253.
diff --git a/wfdb/io/annotation.py b/wfdb/io/annotation.py
@@ -1717,7 +1717,7 @@ def check_read_inputs(sampfrom, sampto, return_label_elements):
         return_label_elements = [return_label_elements]
 
     if set.union(set(ann_label_fields), set(return_label_elements))!=set(ann_label_fields):
-        raise ValueError('return_label_elements must be a list containing one or more of the following elements:',label_types)
+        raise ValueError('return_label_elements must be a list containing one or more of the following elements:',ann_label_fields)
 
     return return_label_elements
 
