XCode 3.1, debugging, n00b question

I apologize in advance but I am completely new to Mac programming and Objective C. I have been following the Foundation tutorial from CocoaLab.com (the Become An X Coder, specifically this part http://www.cocoalab.com/?q=node/11) and have hit a small stumbling block that I believe is related to running XCode 3.1 and not the older version from the tutorial.
#import <Foundation/Foundation.h>
int main (int argc, const char * argv[])
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
// insert code here...
NSLog(@"Julia is my favourite actress") //Whoops, forgot the semicolon!
[pool drain]; //[2.9]
return 0;
My issue is that I don't have numbers in my left margin corresponding to my lines of code. Nor do I get any error messages when I click "Build and Go", even if I purposely leave out a semicolon or other symbol. The tutorial also references a "Run Log window" but I don't know what or where that is either.
Is there something that I might have done to turn off the error messages by accident? To the best of my knowledge, XCode is running with all the default settings (I have not changed any willingly).
Thanks for any info you can provide to help me with my id10t error
JMF

EDIT: After changing the setting per your instructions and relaunching XCode, it now seems to be working. I didn't think I'd have to restart XCode for the settings to take effect. Why aren't these features (displaying the numbers for the lines of code and error messaging) automatically enabled when XCode is installed? It seems counter-intuitive to me.
In any event, *THANK YOU* so much for you replies and help. GREATLY appreciated!
Thanks again, it was set to 'Never' and I changed it to Errors and Warnings. Are there specific settings you recommend for Errors and Warnings Smartgroup and Message Bubbles?
After building and running the app (still without the semicolon), XCode still claims a successful build and displays no known errors. I'm not sure what I have set wrong or what I am doing wrong (apart from willfully leaving out the semicolon per the tutorial's instructions) but I still don't get any error messages from Xcode 3.1.
Has this feature:
http://www.cocoalab.com/media/becomeanxcoder/05/05parseerror.png
been removed from Xcode 3.1 and replaced with something else?
Again, thank you very much for all your help. I'm extremely grateful.
Message was edited by: JMF

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