Hello @tetron In https://github.com/common-workflow-language/cwltool/blob/master/cwltool/expression.py#L24 `schema_salad.ref_resolver.resolve_json_pointer` is used but this function was dropped in schema_salad on December 8th in https://github.com/common-workflow-language/schema_salad/commit/f647d86f0597961f244840c9c673470e7aa2153c#diff-ceb29e0b30c435fbee3c927af99c9f35L420 Looks like we need a test for this codepath & a fix