# Cwltool/provenance worfklow.cwl#main vs workflow.cwl

**URL:** <https://cwl.discourse.group/t/cwltool-provenance-worfklow-cwl-main-vs-workflow-cwl/948>\
**Category:** CWL Questions\
**Created:** [September 2, 2024, 3:00pm UTC](https://cwl.discourse.group/t/cwltool-provenance-worfklow-cwl-main-vs-workflow-cwl/948 "2024-09-02T15:00:25Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![FabriceBrito](https://yyz2.discourse-cdn.com/free1/user_avatar/cwl.discourse.group/fabricebrito/32/114_2.png) [@FabriceBrito](https://cwl.discourse.group/u/FabriceBrito)\
**Post date:** [September 2, 2024, 3:00pm UTC](https://cwl.discourse.group/t/cwltool-provenance-worfklow-cwl-main-vs-workflow-cwl/948/1 "2024-09-02T15:00:25Z")

</div>

I think I ran into a small issue in cwltool.

`cwltool --provenance /tmp/provenance workflow.cwl#main params.yml` works fine, instead  
`cwltool --provenance /tmp/provenance app-package.cwl params.yml` throws an exception:

```auto
ERROR I'm sorry, I couldn't load this CWL file.
The error was: 
Traceback (most recent call last):
  File "/home/fbrito/.local/share/hatch/env/virtual/calrissian/0yKKXZFZ/calrissian/lib/python3.12/site-packages/cwltool/main.py", line 1119, in main
    packed_workflow(runtimeContext.research_obj, print_pack(loadingContext, uri))
                                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/fbrito/.local/share/hatch/env/virtual/calrissian/0yKKXZFZ/calrissian/lib/python3.12/site-packages/cwltool/main.py", line 633, in print_pack
    packed = pack(loadingContext, uri)
             ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/fbrito/.local/share/hatch/env/virtual/calrissian/0yKKXZFZ/calrissian/lib/python3.12/site-packages/cwltool/pack.py", line 181, in pack
    find_run(processobj, loadref, runs)
  File "/home/fbrito/.local/share/hatch/env/virtual/calrissian/0yKKXZFZ/calrissian/lib/python3.12/site-packages/cwltool/pack.py", line 37, in find_run
    find_run(s, loadref, runs)
  File "/home/fbrito/.local/share/hatch/env/virtual/calrissian/0yKKXZFZ/calrissian/lib/python3.12/site-packages/cwltool/pack.py", line 44, in find_run
    find_run(s, loadref, runs)
  File "/home/fbrito/.local/share/hatch/env/virtual/calrissian/0yKKXZFZ/calrissian/lib/python3.12/site-packages/cwltool/pack.py", line 37, in find_run
    find_run(s, loadref, runs)
  File "/home/fbrito/.local/share/hatch/env/virtual/calrissian/0yKKXZFZ/calrissian/lib/python3.12/site-packages/cwltool/pack.py", line 42, in find_run
    find_run(loadref(None, d["run"]), loadref, runs)
             ^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/fbrito/.local/share/hatch/env/virtual/calrissian/0yKKXZFZ/calrissian/lib/python3.12/site-packages/cwltool/pack.py", line 162, in loadref
    lr_loadingContext, lr_uri = resolve_and_validate_document(
                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/fbrito/.local/share/hatch/env/virtual/calrissian/0yKKXZFZ/calrissian/lib/python3.12/site-packages/cwltool/load_tool.py", line 507, in resolve_and_validate_document
    document_loader.resolve_all(workflowobj, fileuri)
  File "schema_salad/ref_resolver.py", line 926, in resolve_all
  File "schema_salad/ref_resolver.py", line 804, in _normalize_fields
TypeError: 'NoneType' object is not subscriptable

```

Is this related to the fact that `main` should not be the default entry point?  
If so, shouldn’t we gracefully trap the issue ?

cwltool==3.1.20240708091337