diff --git a/modules/aeolus/datasource.py b/modules/aeolus/datasource.py
index 0615ef7df1fd71e7b1c946801bb141549254818d..0528e603af5c6a3f385c3a65645c6df0c47a97c2 100644
--- a/modules/aeolus/datasource.py
+++ b/modules/aeolus/datasource.py
@@ -86,7 +86,7 @@ class Files:
         elif fnmatch.fnmatch(files_path, pattern):
             self.flist.append(files_path)
         if len(self.flist) == 0:
-            raise GenericException('no matching files found in: ' + files_path + 'matching: ' + pattern)
+            raise GenericException('no matching files found in: ' + files_path + '  matching: ' + pattern)
 
         self.ftimes = []
         self.span_seconds = datetime.timedelta(minutes=file_time_span).seconds