typo

src/caosadvancedtools/table_importer.py

@@ -89,7 +89,7 @@ def win_path_converter(val):
 
     if not check_win_path(val):
         raise ValueError(
-            "Field should a Windows path, but is\n'{}'.".format(val))
+            "Field should be a Windows path, but is\n'{}'.".format(val))
     path = pathlib.PureWindowsPath(val)
 
     return path.as_posix()