Cant build any programs. Error --invalid host string 'localhost'

Discussion in 'Mac Programming' started by teamrusnac, Jun 8, 2012.

  1. teamrusnac, Jun 8, 2012
    Last edited by a moderator: Jun 9, 2012

    teamrusnac macrumors newbie

    May 19, 2012
    I am trying to run in command line tool the following code:

    #import <Foundation/Foundation.h> int main(int argc, const char * argv[]) { @autoreleasepool { 
    // insert code here... 
    NSLog(@"Hello, World!"); 
    return 0; 

    and after "Build Succeeded" I am getting the following error:

    error: failed to launch '/Users/rrusnac/Library/Developer/Xcode/DerivedData/5.1_Practice-gdhkgzautnruix bnobucittithbz/Build/Products/Debug/5.1 Practice ' --invalid host string: 'localhost'

    It doesnt matter what code I enter, I get the same error. I cant figure out for the life of me why this is happening. I am running Xcode 4.3.2 and Lion 10.7.4.

    The programs build and run with no Issues, but this error always pops up. Please help me!
  2. FenrisMoonlight macrumors 6502a


    Jun 25, 2012
    Los Angeles
    Check your /etc/hosts file and make sure it contains an entry for localhost. Default /etc/hosts should have the following entries

    Code:       localhost broadcasthost
    ::1             localhost 
    fe80::1%lo0     localhost
  3. ftorre104 macrumors newbie

    Jul 17, 2014

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