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Authenticate error when creating new project

I'm newbie


I have used Sandbox environment on Enterprise edition until now.


For my study, I created new account on Developer Edition.

I tried to create new project on IDE.

But I have the following authenticate error .


   -Error Message-  I'm translating to English.

     Unable to connect to hostname ''.

     User name , password , security token is invalid . Or this user is locked.

     Do you login from new location ?

     - - - - - - -

     Please verify and/or change your credentials


 What is cause? Please help me !! I sincerely need your help!!

Best Answer chosen by Admin (Salesforce Developers) 

Hi all,


This question was fixed by my japanese friend.