diff --git a/tofu/imas2tofu/_core.py b/tofu/imas2tofu/_core.py
index <HASH>..<HASH> 100644
--- a/tofu/imas2tofu/_core.py
+++ b/tofu/imas2tofu/_core.py
@@ -2704,8 +2704,8 @@ class MultiIDSLoader(object):
             if np.any(indnan):
                 nunav, ntot = str(indnan.sum()), str(D.shape[1])
                 msg = "Some lines of sight geometry unavailable in ids:\n"
-                msg += "    - nb. of LOS unavailable: %s / %s\n"%(nunav, ntot)
-                msg += "    - indices: %s"%str(indnan.nonzero()[0])
+                msg += "    - unavailable LOS: {0} / {1}\n".format(nunav, ntot)
+                msg += "    - indices: {0}"%format(str(indnan.nonzero()[0]))
                 warnings.warn(msg)
         else:
             dgeom = None
diff --git a/tofu/version.py b/tofu/version.py
index <HASH>..<HASH> 100644
--- a/tofu/version.py
+++ b/tofu/version.py
@@ -1,2 +1,2 @@
 # Do not edit, pipeline versioning governed by git tags!
-__version__ = '1.4.1-188-g044d87f'
+__version__ = '1.4.1-189-g5ca9e73'
[Issue<I>] PEP8 Compliance