There are numerous things that could be wrong.
-What operating system are you using? It's possible you're trying to use a Snow Leopard-only version of XCode on Leopard (or whatever).
-"uninstalled the old SDK via terminal" doesn't sound like it was a good idea.
-You're right, the error message is not very helpful in Dutch. Could you copy/paste the relevant text somewhere so any of us can get it into Google translate or something? I can't even see the writing because the screenshot is too small.
Yeah,
This is it;
Process: Xcode [587]
Path: /Applications/Applications/Xcode.app/Contents/MacOS/Xcode
Identifier: com.apple.Xcode
Version: ??? (???)
Build Info: DevToolsIDE-16500000~1
Code Type: X86-64 (Native)
Parent Process: launchd [96]
Date/Time: 2010-06-10 21:59:55.233 +0200
OS Version: Mac OS X 10.6.3 (10D573)
Report Version: 6
Interval Since Last Report: 13161 sec
Crashes Since Last Report: 18
Per-App Crashes Since Last Report: 15
Anonymous UUID: 9FEEF489-E60E-4155-905A-C2EF301F9234
Exception Type: EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000002, 0x0000000000000000
Crashed Thread: 0
Dyld Error Message:
Library not loaded: @rpath/DevToolsFoundation.framework/Versions/A/DevToolsFoundation
Referenced from: /Applications/Applications/Xcode.app/Contents/MacOS/Xcode
Reason: image not found
Model: iMac9,1, BootROM IM91.008D.B08, 2 processors, Intel Core 2 Duo, 2.93 GHz, 4 GB, SMC 1.37f3
Graphics: NVIDIA GeForce GT 120, NVIDIA GeForce GT 120, PCIe, 256 MB
Memory Module: global_name
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x8E), Broadcom BCM43xx 1.0 (5.10.91.27)
Bluetooth: Version 2.3.1f4, 2 service, 19 devices, 1 incoming serial ports
Network Service: Ethernet, Ethernet, en0
Serial ATA Device: WDC WD6400AAKS-40H2B0, 596,17 GB
Serial ATA Device: OPTIARC DVD RW AD-5670S
USB Device: Built-in iSight, 0x05ac (Apple Inc.), 0x8502, 0x24400000
USB Device: Keyboard Hub, 0x05ac (Apple Inc.), 0x1005, 0x24300000
USB Device: Apple Optical USB Mouse, 0x05ac (Apple Inc.), 0x0304, 0x24330000
USB Device: Apple Keyboard, 0x05ac (Apple Inc.), 0x021e, 0x24320000
USB Device: Iomega USB2/1394, 0x059b (Iomega Corporation), 0x0271, 0x24100000
USB Device: CLP-310 Series, 0x04e8 (Samsung Electronics Co., Ltd.), 0x328e, 0x26400000
USB Device: IR Receiver, 0x05ac (Apple Inc.), 0x8242, 0x04500000
USB Device: BRCM2046 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0x06100000
USB Device: Bluetooth USB Host Controller, 0x05ac (Apple Inc.), 0x8215, 0x06110000
FireWire Device: d2 quadra (button), LaCie, Up to 800 Mb/sec
I'm using the newest version of snow leopard and an iMac 2.93ghz, 24inch.
I'll try to translate the top of the message.
Xcode can't be opened because there's a problem
Ask the developper Xcode is working with this version of Mac OS X. Maybe you must install the program again. Take care of all the updates for the program and for Mac OS X.