fixed minor bug

Author: ethsanders

src/dotenv/cli.py

@@ -130,9 +130,9 @@ def run(ctx: click.Context, override: bool, commandline: List[str]) -> None:
 def example_file(ctx: click.Context):
     '''Generates a .example.env file without values.'''
     filedir = ctx.obj['FILE'].replace("\\", "/")
-    if not os.path.isfile(file):
+    if not os.path.isfile(filedir):
         raise click.BadParameter(
-            'Path "%s" does not exist.' % (file),
+            'Path "%s" does not exist.' % (filedir),
             ctx=ctx
         )
     newFileList = []