diff --git a/README.md b/README.md
index bd96596..0c62d18 100644
--- a/README.md
+++ b/README.md
@@ -56,6 +56,9 @@
 
 - [Generation of Galaxy ToolConfig files](galaxy/README.md)
 - [Generation of CWL task files](cwl/README.md)
+
+## Fail Policy while processing several Files
+`CTDConverter` can parse several CTDs and convert them. However, the process will be interrupted and an error code will be returned at the first encountered error (e.g., a CTD is not valid, there are missing support files, etc.).
 
 ## Converting a single CTD
 In its simplest form, the converter takes an input CTD file and generates an output file. The following usage of `CTDConverter`:
diff --git a/common/utils.py b/common/utils.py
index d1d4093..95c22af 100644
--- a/common/utils.py
+++ b/common/utils.py
@@ -105,20 +105,18 @@
             error("Could not load validation schema %s. Reason: %s" % (xsd_location, str(e)), 0)
     else:
         warning("Validation against a schema has not been enabled.", 0)
+
     for input_ctd in input_ctds:
-        try:
-            if schema is not None:
-                validate_against_schema(input_ctd, schema)
-            output_file = output_destination
-            # if multiple inputs are being converted, we need to generate a different output_file for each input
-            if is_converting_multiple_ctds:
-                output_file = os.path.join(output_file,
-                                           get_filename_without_suffix(input_ctd) + "." + output_file_extension)
-            info("Parsing %s" % input_ctd)
-            parsed_ctds.append(ParsedCTD(CTDModel(from_file=input_ctd), input_ctd, output_file))
-        except Exception, e:
-            error(str(e), 1)
-            continue
+        if schema is not None:
+            validate_against_schema(input_ctd, schema)
+
+        output_file = output_destination
+        # if multiple inputs are being converted, we need to generate a different output_file for each input
+        if is_converting_multiple_ctds:
+            output_file = os.path.join(output_file, get_filename_without_suffix(input_ctd) + "." + output_file_extension)
+        info("Parsing %s" % input_ctd)
+        parsed_ctds.append(ParsedCTD(CTDModel(from_file=input_ctd), input_ctd, output_file))
+
     return parsed_ctds
 
 
diff --git a/convert.py b/convert.py
index 8b577b5..3d0bbd0 100644
--- a/convert.py
+++ b/convert.py
@@ -215,7 +215,8 @@
                                              converter.get_preferred_file_extension())
 
         # let the converter do its own thing
-        return converter.convert_models(args, parsed_ctds)
+        converter.convert_models(args, parsed_ctds)
+        return 0
 
     except KeyboardInterrupt:
         print("Interrupted...")
diff --git a/cwl/converter.py b/cwl/converter.py
index ec3a1a6..8188558 100755
--- a/cwl/converter.py
+++ b/cwl/converter.py
@@ -77,8 +77,6 @@
         stream.write("# Visit https://github.com/WorkflowConversion/CTDConverter for more information.\n\n")
         yaml.dump(cwl_tool, stream, default_flow_style=False)
         stream.close()
-
-    return 0
 
 
 # returns a dictionary
diff --git a/galaxy/converter.py b/galaxy/converter.py
index f05fee9..7f3e542 100755
--- a/galaxy/converter.py
+++ b/galaxy/converter.py
@@ -102,8 +102,6 @@
         # generate datatypes_conf.xml
         if args.data_types_destination is not None:
             generate_data_type_conf(supported_file_formats, args.data_types_destination)
-
-        return 0
 
 
 def parse_tools_list_file(tools_list_file):