Error on create page

[JaydeepSinroja]

when i try to create page than error occured and after that says, "The page [page_name] already exists" but actually there is no page on that name

Unhandled exception:
type 'String' is not a subtype of type 'Map<dynamic, dynamic>' in type cast
#0 PubspecUtils._extraFolder. (package:get_cli/common/utils/pubspec/pubspec_utils.dart:46:32)
#1 _PubValue.value (package:get_cli/common/utils/pubspec/pubspec_utils.dart:172:26)
#2 PubspecUtils.extraFolder (package:get_cli/common/utils/pubspec/pubspec_utils.dart:57:48)
#3 CreatePageCommand._writeFiles (package:get_cli/commands/impl/create/page/page.dart:80:36)
#4 CreatePageCommand.checkForAlreadyExists (package:get_cli/commands/impl/create/page/page.dart:74:7)
#5 CreatePageCommand.execute (package:get_cli/commands/impl/create/page/page.dart:38:5)
#6 main (file:///C:/Users/appit/AppData/Local/Pub/Cache/git/get_cli-0cbdef3d191a49f371315fb6ab899e32dfc64358/bin/get.dart:18:23)
#7 _delayEntrypointInvocation. (dart:isolate-patch/isolate_patch.dart:295:33)
#8 _RawReceivePort._handleMessage (dart:isolate-patch/isolate_patch.dart:184:12)

1. Yes!
2. No
3. I want to rename
   The page [page_name] already exists, do you want to overwrite it? [1]
   Unhandled exception:
   type 'String' is not a subtype of type 'Map<dynamic, dynamic>' in type cast
   #0 PubspecUtils._extraFolder. (package:get_cli/common/utils/pubspec/pubspec_utils.dart:46:32)
   Install e update implemented #1 _PubValue.value (package:get_cli/common/utils/pubspec/pubspec_utils.dart:172:26)
   Allow setting custom package when using get create project command #2 PubspecUtils.extraFolder (package:get_cli/common/utils/pubspec/pubspec_utils.dart:57:48)
   Ask whether or not you want to replace existing files when using a command. #3 CreatePageCommand._writeFiles (package:get_cli/commands/impl/create/page/page.dart:80:36)
   Fix Readme #4 CreatePageCommand.checkForAlreadyExists (package:get_cli/commands/impl/create/page/page.dart:64:9)
   Several improvements for style and english texts. #5 CreatePageCommand.execute (package:get_cli/commands/impl/create/page/page.dart:38:5)
   Localization generator request #6 main (file:///C:/Users/appit/AppData/Local/Pub/Cache/git/get_cli-0cbdef3d191a49f371315fb6ab899e32dfc64358/bin/get.dart:18:23)
   Localization generator feature #7 _delayEntrypointInvocation. (dart:isolate-patch/isolate_patch.dart:295:33)
   added generate localization to readme #8 _RawReceivePort._handleMessage (dart:isolate-patch/isolate_patch.dart:184:12)

[JaydeepSinroja]

when i remove
get_cli:
sub_folder:false
than it's work fine