Unexpected token in JSON at position 0 in npm i -g nativeScript

[NickIliev]

From @VentsislavDinev on September 22, 2017 23:15

Hello, i try to install NativeScript but i have this problem:
"C:>tns
Unexpected token in JSON at position 0
Failed to display command help SyntaxError: Unexpected token in JSON at position 0
at Object.parse (native)
at FileSystem.readJson (C:\Users*\AppData\Roaming\npm\node_modules\nativescript\lib\common\file-system.js:171:25)
at UserSettingsService. (C:\Users*\AppData\Roaming\npm\node_modules\nativescript\lib\common\services\user-settings-service.js:92:46)
at next (native)
at C:\Users*\AppData\Roaming\npm\node_modules\nativescript\lib\common\services\user-settings-service.js:7:71
at __awaiter (C:\Users*\AppData\Roaming\npm\node_modules\nativescript\lib\common\services\user-settings-service.js:3:12)
at UserSettingsService.loadUserSettingsData (C:\Users*\AppData\Roaming\npm\node_modules\nativescript\lib\common\services\user-settings-service.js:82:16)
at UserSettingsService. (C:\Users*\AppData\Roaming\npm\node_modules\nativescript\lib\services\user-settings-service.js:20:24)
at next (native)
at C:\Users**\AppData\Roaming\npm\node_modules\nativescript\lib\services\user-settings-service.js:7:71
Error while reporting exception: SyntaxError: Unexpected token in JSON at position 0"
Please help for fix this problem.

Copied from original issue: NativeScript/NativeScript#4878

[NickIliev]

From @paceair on September 24, 2017 7:28

probably due to empty content in user-settings.json at
c:\Users\xxxxxxx\AppData\Roaming.nativescript-cli

[dtopuzov]

Duplicate of #3151