Designer crashes on startup

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   libsystem_kernel.dylib        	0x00007fff9464b0aa __abort_with_payload + 10
1   libsystem_kernel.dylib        	0x00007fff94647326 abort_with_payload_wrapper_internal + 90
2   libsystem_kernel.dylib        	0x00007fff946472cc abort_with_reason + 22
3   libobjc.A.dylib               	0x00007fff93c391b2 _objc_fatalv(unsigned long long, unsigned long long, char const*, __va_list_tag*) + 102
4   libobjc.A.dylib               	0x00007fff93c3904d _objc_fatal(char const*, ...) + 154
5   libobjc.A.dylib               	0x00007fff93c39688 alt_handler_error(unsigned long) + 397
6   libobjc.A.dylib               	0x00007fff93c34b6b objc_removeExceptionHandler + 310
7   com.apple.CoreFoundation      	0x00007fff7ed76258 _CFDoExceptionOperation + 88
8   com.apple.AppKit              	0x00007fff7cafecf4 -[NSApplication endModalSession:] + 24
9   libqcocoa.dylib               	0x000000010439e4ef QCocoaEventDispatcherPrivate::temporarilyStopAllModalSessions() + 207
10  libqcocoa.dylib               	0x000000010439e7bb QCocoaEventDispatcherPrivate::processPostedEvents() + 107
11  libqcocoa.dylib               	0x000000010439f0c1 QCocoaEventDispatcherPrivate::postedEventsSourceCallback(void*) + 33
12  com.apple.CoreFoundation      	0x00007fff7edb6321 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
13  com.apple.CoreFoundation      	0x00007fff7ed9721d __CFRunLoopDoSources0 + 557
14  com.apple.CoreFoundation      	0x00007fff7ed96716 __CFRunLoopRun + 934
15  com.apple.CoreFoundation      	0x00007fff7ed96114 CFRunLoopRunSpecific + 420
16  com.apple.HIToolbox           	0x00007fff7e2f6ebc RunCurrentEventLoopInMode + 240
17  com.apple.HIToolbox           	0x00007fff7e2f6bf9 ReceiveNextEventCommon + 184
18  com.apple.HIToolbox           	0x00007fff7e2f6b26 _BlockUntilNextEventMatchingListInModeWithFilter + 71
19  com.apple.AppKit              	0x00007fff7c88da54 _DPSNextEvent + 1120
20  com.apple.AppKit              	0x00007fff7d0097ee -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 2796
21  com.apple.AppKit              	0x00007fff7c8823db -[NSApplication run] + 926
22  libqcocoa.dylib               	0x000000010439debd QCocoaEventDispatcher::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) + 2397
23  org.qt-project.QtCore         	0x000000010241c8c2 QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) + 418
24  org.qt-project.QtCore         	0x0000000102421482 QCoreApplication::exec() + 402
25  org.qt-project.Designer       	0x0000000101083c41 0x101070000 + 80961
26  libdyld.dylib                 	0x00007fff9451d235 start + 1