diff --git a/csst_common/data_manager.py b/csst_common/data_manager.py
index a54004d78766bb34dbd6f5a88ab549219c38ff7b..127ae3009779526e51fc0d1d922ef21eafbab189 100644
--- a/csst_common/data_manager.py
+++ b/csst_common/data_manager.py
@@ -1017,7 +1017,6 @@ class CsstMsFile(dict):
 
         self.filename = os.path.basename(filepath)
         self.dir_l0 = os.path.dirname(filepath)
-        print("parsing", filepath)
         # parse filename
         pattern = re.compile(
             r"(?P<telescope>[A-Z]+)_"
@@ -1033,7 +1032,11 @@ class CsstMsFile(dict):
             r"(?P<ext>[a-zA-Z._]+)"
         )
         mo = re.fullmatch(pattern, self.filename)
-        assert mo is not None
+        try:
+            assert mo is not None
+        except AssertionError as ae:
+            print(self.filename)
+            raise ae
         mogd = mo.groupdict()
         # mogd.pop("detector")
 
@@ -1079,6 +1082,8 @@ class CsstMsFile(dict):
         return CsstMsFile(
             filepath=rec["data"].file_path, ver_sim=ver_sim, dir_l0=dir_l0, dir_l1=dir_l1, dfs_root=dfs_root, **header)
 
+    def __repr__(self):
+        return f"CsstMsFile({self.filename})"
 # file = CsstMsFile(
 #     "L1/MSC/SCI/62173/10160000108/CSST_MSC_MS_SCI_20290206174352_20290206174622_10160000108_21_L1_V01.fits")
 #