diff --git a/wetb/hawc2/hawc2_simulation.py b/wetb/hawc2/hawc2_simulation.py
index 820b1a2604d8633bca0c8ff6c288ba1886e49146..6b704b9f3b526b1195f15d262e25c7f9d7d07cc5 100644
--- a/wetb/hawc2/hawc2_simulation.py
+++ b/wetb/hawc2/hawc2_simulation.py
@@ -247,11 +247,11 @@ class Hawc2_Simulation(object):
         if not os.path.isfile(accompanying_file) and not os.path.isdir(accompanying_file):
             accompanying_file=os.path.join(self.source_directory,accompanying_file)
             if not os.path.isfile(accompanying_file) and not os.path.isdir(accompanying_file):
-                raise ValueError('The accompanying file must be contained within the directory of the HTC file, or one of the sub-directories')
+                raise ValueError('The accompanying file must be contained within the directory of the HTC file, or one of the sub-directories. file: {} not found'.format(accompanying_file))
         else:
             accompanying_file=os.path.abspath(os.path.realpath(accompanying_file))
         if not accompanying_file.startswith(self.source_directory):
-            raise ValueError('The accompanying file must be contained within the directory of the HTC file, or one of the sub-directories')
+            raise ValueError('The accompanying file must be contained within the directory of the HTC file, or one of the sub-directories. file: {} not found'.format(accompanying_file))
         destination=accompanying_file[len(self.source_directory)+1:]
         self.accompanying_files.append(accompanying_file)
         self.accompanying_destinations.append(destination)