X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/3a88a5d8753593be89373c5b124fc5a8398457a0..91f1e7009305109db0bfb6405adbd11357745bfc:/sdk/cwl/arvados_cwl/__init__.py?ds=inline

diff --git a/sdk/cwl/arvados_cwl/__init__.py b/sdk/cwl/arvados_cwl/__init__.py
index 1d2fa291ec..ed784f56c5 100644
--- a/sdk/cwl/arvados_cwl/__init__.py
+++ b/sdk/cwl/arvados_cwl/__init__.py
@@ -247,10 +247,13 @@ class ArvCwlRunner(object):
                 raise Exception("Output source is not in keep or a literal")
             sp = k.split("/")
             srccollection = sp[0][5:]
-            reader = self.collection_cache.get(srccollection)
             try:
+                reader = self.collection_cache.get(srccollection)
                 srcpath = "/".join(sp[1:]) if len(sp) > 1 else "."
                 final.copy(srcpath, v.target, source_collection=reader, overwrite=False)
+            except arvados.errors.ArgumentError as e:
+                logger.error("Creating CollectionReader for '%s' '%s': %s", k, v, e)
+                raise
             except IOError as e:
                 logger.warn("While preparing output collection: %s", e)