I fixed this error by
uncommenting  *gem 'therubyracer', 'platforms: :ruby' * # this is a 
javascript runtime
in Gemfile

Thank you, Colin.

在 2015年12月14日星期一 UTC+8下午5:05:54,Colin Law写道:
>
> On 14 December 2015 at 07:42, Fu Qiang Zhang <[email protected] 
> <javascript:>> wrote:
>
>> I am new to rails.
>>
>>
>> After I setup *env :*
>>
>> <https://lh3.googleusercontent.com/-dHZwTLXY3yE/Vm5xFtHp13I/AAAAAAAAB7s/PhmgkuumaE4/s1600/2015-12-14_153429.png>
>> 1. created first project with command *rails new firstrail*
>> 2. Enter demo directory
>> 3. run command *rails server*
>>  
>>
>
>>
>> Here, I got the *error* *:*
>>
>>
>> <https://lh3.googleusercontent.com/-x_gudNvq7Qc/Vm5yAfZHTlI/AAAAAAAAB74/_J9_BzRtjU8/s1600/2015-12-14_153756.png>
>> uglifier 2.7.2 was installed. I don't know how to fix this error.
>> Does any know how to fix this ?
>> *Please* help me out, thank you !
>>
>  
> Do you see any errors if you run
> bundle install
> It should not have been necessary to run it manually as it is run 
> automatically when you do rails new, but perhaps there was an error that 
> you did not notice.  It is necessary to re-run bundle if you change Gemfile.
>
> Otherwise then post the details of the error when you run the server 
> please.  Copy/paste the full terminal output that you get when you run
> rails s
>
> Colin
>
>

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