Build is Crashing on Start

How can I get to the bottom of what's going on in this crash report? Is there something specific that might point to what I might have done wrong? It runs fine in Unity when I play it. Where might be a good place to start debugging things?

Process:               RollBallRoll [3441]
Path:                  /Users/USER/Desktop/RollBallRoll.app/Contents/MacOS/RollBallRoll
Identifier:            unity.DefaultCompany.RollBallRoll
Version:               Unity Player version 5.1.3f1 (5.1.3f1)
Code Type:             X86 (Native)
Parent Process:        ??? [1]
Responsible:           RollBallRoll [3441]
User ID:               501

Date/Time:             2015-09-21 13:45:36.439 -0500
OS Version:            Mac OS X 10.10.5 (14F27)
Report Version:        11
Anonymous UUID:        C2286B65-7F88-7C2F-3532-0F6020730C33


Time Awake Since Boot: 1900 seconds

Crashed Thread:        0  Dispatch queue: com.apple.main-thread

Exception Type:        EXC_BREAKPOINT (SIGTRAP)
Exception Codes:       0x0000000000000002, 0x0000000000000000

Dyld Error Message:
  Symbol not found: _mono_set_dirs
  Referenced from: /Users/USER/Desktop/RollBallRoll.app/Contents/MacOS/RollBallRoll
  Expected in: /Users/USER/Desktop/RollBallRoll.app/Contents/MacOS/../Frameworks/MonoEmbedRuntime/osx/libmono.0.dylib

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   dyld                            0x8fea8085 dyld_fatal_error + 1
1   dyld                            0x8feab175 dyld::fastBindLazySymbol(ImageLoader**, unsigned long) + 184
2   libdyld.dylib                   0x919ab46c dyld_stub_binder_ + 20
3   unity.DefaultCompany.RollBallRoll   0x009dcaf1 0x1000 + 10337009
4   unity.DefaultCompany.RollBallRoll   0x00e622f3 0x1000 + 15078131
5   unity.DefaultCompany.RollBallRoll   0x00e63c2d 0x1000 + 15084589
6   com.apple.Foundation            0x97f880f3 __57-[NSNotificationCenter addObserver:selector:name:object:]_block_invoke + 50
7   com.apple.CoreFoundation        0x91addc34 __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 20
8   com.apple.CoreFoundation        0x919bd901 _CFXNotificationPost + 3713
9   com.apple.Foundation            0x97f692c4 -[NSNotificationCenter postNotificationName:object:userInfo:] + 92
10  com.apple.AppKit                0x94fcf868 -[NSApplication _postDidFinishNotification] + 365
11  com.apple.AppKit                0x94fcf558 -[NSApplication _sendFinishLaunchingNotification] + 239
12  com.apple.AppKit                0x94fcc05d -[NSApplication(NSAppleEventHandling) _handleAEOpenEvent:] + 827
13  com.apple.AppKit                0x94fcb92a -[NSApplication(NSAppleEventHandling) _handleCoreEvent:withReplyEvent:] + 277
14  libobjc.A.dylib                 0x9bd55119 -[NSObject performSelector:withObject:withObject:] + 84
15  com.apple.Foundation            0x97f9fe57 __76-[NSAppleEventManager setEventHandler:andSelector:forEventClass:andEventID:]_block_invoke + 118
16  com.apple.Foundation            0x97f9f99f -[NSAppleEventManager dispatchRawAppleEvent:withRawReply:handlerRefCon:] + 451
17  com.apple.Foundation            0x97f9f794 _NSAppleEventManagerGenericHandler + 211
18  com.apple.AE                    0x9bac294e aeDispatchAppleEvent(AEDesc const*, AEDesc*, unsigned long, unsigned char*) + 583
19  com.apple.AE                    0x9ba8d467 dispatchEventAndSendReply(AEDesc const*, AEDesc*) + 44
20  com.apple.AE                    0x9ba8d35a aeProcessAppleEvent + 313
21  com.apple.HIToolbox             0x9064e1c1 AEProcessAppleEvent + 55
22  com.apple.AppKit                0x94fc52ee _DPSNextEvent + 2707
23  com.apple.AppKit                0x94fc41e5 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 350
24  com.apple.AppKit                0x94fb8b9c -[NSApplication run] + 907
25  com.apple.AppKit                0x94f2dfa0 NSApplicationMain + 2082
26  unity.DefaultCompany.RollBallRoll   0x00e62ef3 0x1000 + 15081203
27  unity.DefaultCompany.RollBallRoll   0x00002c55 0x1000 + 7253

Thread 1:: Dispatch queue: com.apple.libdispatch-manager
0   libsystem_kernel.dylib          0x924c38ce kevent64 + 10
1   libdispatch.dylib               0x9870673f _dispatch_mgr_invoke + 245
2   libdispatch.dylib               0x987063a2 _dispatch_mgr_thread + 52

Thread 2:
0   libsystem_kernel.dylib          0x924c2e6a __workq_kernreturn + 10
1   libsystem_pthread.dylib         0x9a45372a _pthread_wqthread + 939
2   libsystem_pthread.dylib         0x9a450e0e start_wqthread + 30

Thread 3:
0   libsystem_kernel.dylib          0x924c2e6a __workq_kernreturn + 10
1   libsystem_pthread.dylib         0x9a45372a _pthread_wqthread + 939
2   libsystem_pthread.dylib         0x9a450e0e start_wqthread + 30

Thread 4:
0   libsystem_kernel.dylib          0x924c2e6a __workq_kernreturn + 10
1   libsystem_pthread.dylib         0x9a45372a _pthread_wqthread + 939
2   libsystem_pthread.dylib         0x9a450e0e start_wqthread + 30

Thread 5:
0   libsystem_kernel.dylib          0x924c2e6a __workq_kernreturn + 10
1   libsystem_pthread.dylib         0x9a45372a _pthread_wqthread + 939
2   libsystem_pthread.dylib         0x9a450e0e start_wqthread + 30

Thread 6:
0   libsystem_kernel.dylib          0x924c2e6a __workq_kernreturn + 10
1   libsystem_pthread.dylib         0x9a45372a _pthread_wqthread + 939
2   libsystem_pthread.dylib         0x9a450e0e start_wqthread + 30

Thread 7:
0   libsystem_kernel.dylib          0x924c2e6a __workq_kernreturn + 10
1   libsystem_pthread.dylib         0x9a45372a _pthread_wqthread + 939
2   libsystem_pthread.dylib         0x9a450e0e start_wqthread + 30

Thread 8:
0   libsystem_kernel.dylib          0x924c2e6a __workq_kernreturn + 10
1   libsystem_pthread.dylib         0x9a45372a _pthread_wqthread + 939
2   libsystem_pthread.dylib         0x9a450e0e start_wqthread + 30

Thread 9:
0   libsystem_kernel.dylib          0x924c2e6a __workq_kernreturn + 10
1   libsystem_pthread.dylib         0x9a45372a _pthread_wqthread + 939
2   libsystem_pthread.dylib         0x9a450e0e start_wqthread + 30

Thread 0 crashed with X86 Thread State (32-bit):
  eax: 0x8fedc52c  ebx: 0x919ab3cd  ecx: 0x00000000  edx: 0x8ff044c0
  edi: 0x8ff044c0  esi: 0x8feaafd4  ebp: 0xbfffe9e8  esp: 0xbfffe9cc
   ss: 0x00000023  efl: 0x00000246  eip: 0x8fea8085   cs: 0x0000001b
   ds: 0x00000023   es: 0x00000023   fs: 0x00000000   gs: 0x0000000f
  cr2: 0x07fff000

Logical CPU:     4
Error Code:      0x00000000
Trap Number:     3


Binary Images:
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