It seems to happen when I switch between projects and when I save a file.
Here are the details:
`Exception Name: NSRangeException
Description: Cannot remove an observer <MainFrameController 0x10072b450> for the key path "runningApplications" from <NSWorkspace 0x10100dd00> because it is not registered as an observer.
User Info: (null)
0 CoreFoundation 0x00007fffa82c252b __exceptionPreprocess + 171
1 libobjc.A.dylib 0x00007fffbc990cad objc_exception_throw + 48
2 CoreFoundation 0x00007fffa8340a0d +[NSException raise:format:] + 205
3 Foundation 0x00007fffa9c6ea1f -[NSObject(NSKeyValueObserverRegistration) _removeObserver:forProperty:] + 493
4 Foundation 0x00007fffa9c6e7d9 -[NSObject(NSKeyValueObserverRegistration) removeObserver:forKeyPath:] + 84
5 AppKit 0x00007fffa6712d96 -[NSWorkspace removeObserver:forKeyPath:] + 55
6 Foundation 0x00007fffa9cdc932 -[NSObject(NSKeyValueObserverRegistration) removeObserver:forKeyPath:context:] + 177
7 RStudio 0x0000000100018624 -[MainFrameController dealloc] + 68
8 libobjc.A.dylib 0x00007fffbc98adb7 _ZN11objc_object17sidetable_releaseEb + 285
9 AppKit 0x00007fffa5edfe89 -[NSWindowController release] + 155
10 libobjc.A.dylib 0x00007fffbc985e8d _ZN12_GLOBAL__N_119AutoreleasePoolPage3popEPv + 781
11 CoreFoundation 0x00007fffa81f7496 _CFAutoreleasePoolPop + 22
12 CoreFoundation 0x00007fffa8241e14 CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION + 20
13 CoreFoundation 0x00007fffa8241a9f __CFRunLoopDoTimer + 1071
14 CoreFoundation 0x00007fffa82415fa __CFRunLoopDoTimers + 298
15 CoreFoundation 0x00007fffa8239021 __CFRunLoopRun + 2065
16 CoreFoundation 0x00007fffa82385b4 CFRunLoopRunSpecific + 420
17 HIToolbox 0x00007fffa77d9f6c RunCurrentEventLoopInMode + 240
18 HIToolbox 0x00007fffa77d9da1 ReceiveNextEventCommon + 432
19 HIToolbox 0x00007fffa77d9bd6 _BlockUntilNextEventMatchingListInModeWithFilter + 71
20 AppKit 0x00007fffa5ed05f5 _DPSNextEvent + 1093
21 AppKit 0x00007fffa65e08eb -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 1637
22 AppKit 0x00007fffa5ec4fbd -[NSApplication run] + 926
23 RStudio 0x00000001000180ba main + 330
24 RStudio 0x00000001000042e4 start + 52`
System info:
Version 1.1.383 – © 2009-2017 RStudio, Inc. Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12) AppleWebKit/602.1.50 (KHTML, like Gecko)
Any thoughts?