config key error: fix format string (#23610)

2021-05-13 02:20:32 -07:00
parent 97e6c0fda4
commit 190b043161
1 changed files with 1 additions and 1 deletions
--- a/lib/spack/spack/config.py
+++ b/lib/spack/spack/config.py
@@ -129,7 +129,7 @@ def first_existing(dictionary, keys):
    try:
        return next(k for k in keys if k in dictionary)
    except StopIteration:
-        raise KeyError("None of %s is in dict!" % keys)
+        raise KeyError("None of %s is in dict!" % str(keys))


 class ConfigScope(object):