Huge problems with Xcode + iPhone simulator crashing and errors

[Mjsdabeast]

Okay, so my Xcode and iPhone simulator have become really screwed up lately, all i remember doing right before this started happening is i turned off my mac. So, my first problem is that every time i open up iPhone simulator, it says the simulated application can't be run and asks to switch sdk and i click 5.0 and it keeps on saying that. I have tried reinstalling Xcode 3 times now. Second, whenever i go to open up the MainStoryboard.iphone/ipad files, Xcode freezes up and gives me the option to either crash or continue in a poor state or something like that. Next, the app I'm trying to create used to work, but then all of a sudden, it would crash at startup with this error message:

dyld: Symbol not found: ___CFObjCIsCollectable
    Referenced from: /System/Library/Frameworks/Security.framework/Versions/A/Security
    Expected in:/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.0.sdk/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation
    in /System/Library/Frameworks/Security.framework/Versions/A/Security
    2012-01-03 21:02:45.802 ibtoold[1399:d03] [MT] DVTAssertions: ASSERTION FAILURE in /SourceCache/IDEInterfaceBuilderCocoaTouch/IDEInterfaceBuilderCocoaTouch-933/IBPlugin/Utilities/IBObjectMarshalling.m:179

    Details:  Interface Builder encountered an error communicating with the iOS Simulator. "Interface Builder Cocoa Touch Tool" (1402) failed to launch and exited with status (null), signal 5. Please check Console.app for crash reports for "Interface Builder Cocoa Touch Tool" for further information.
    Function: NSDistantObject<IBCocoaTouchToolProtocol> *IBAttachToCocoaTouchTool(IBCocoaTouchTargetRuntime *)
    Thread:   <NSThread: 0x40010a220>{name = (null), num = 1}

That is the error that i got when beginning to run the app, now instead, it just gives me two errors while building the app and here is what those say:

Command /Developer/usr/bin/ibtool failed with exit code 255
    Verify exit code of build task 'CompileStoryboard MainStoryboard_iPhone.storyboard'
    Build task failed without generating error messages.

These have to be in some way related and it has either to do with the storyboard settings or the iOS simulator, this has been a huge setback for the making of my app, if anyone has had this issue, please help

EDIT: ok have been trying to see if this same thing happens on other projects and it seems to be only that app with the errors, but IOS simulator doesn't work for anything. Also, literally every other thing i try to do on Xcode now prompts a crash, even trying to open up a project and look at errors in new window.

There is no solution for this problem whatsoever on the internet, or at least that works.

[Mjsdabeast]

no one has an answer to this, i have had this posted on two forums now for over 2 weeks and not a single solution, please please please heeeelllppp

[Mjsdabeast]

Ok after giving up on fixing this for a while, i uninstalled Xcode and didn't install it for about two weeks. When i reinstalled, it worked perfectly fine for 3 days up until today, i had not been messing with any settings or anything related to Xcode and this problem is seriously pissing me off. Please, if anyone knows what to do, i have had this problem for 2 months and still no answers. This person here describes the issue i have better than i do if you don't get what i am saying:
iphone - xcode won't compile iOS apps, crashes when .xib or .storyboard files are opened - Stack Overflow
This is a problem that seems to just come out of nowhere, also i don't have that application that caused the other guy's problem on that other thread.

[fiftysixty]

What command did you use to unistall Xcode? Your situation sounds like some file(s) have become corrupted so it would be important to get rid of everything in the devtools.

[Mjsdabeast]

Originally Posted by fiftysixty

What command did you use to unistall Xcode? Your situation sounds like some file(s) have become corrupted so it would be important to get rid of everything in the devtools.

i used this command:

sudo /Developer/Library/uninstall-devtools –mode=all

[Mjsdabeast]

Originally Posted by Mjsdabeast

i used this command:

sudo /Developer/Library/uninstall-devtools –mode=all

holy **** people, i can't do anything until i have this fixed. I'm thinking about taking my computer to apple to see what the hell is wrong! Not a single person on the internet has come up with a solution for this