# \[FMOD\] OutputCoreAudio::suspend : Cannot start audio unit. (err: 561015905) (IOS) **URL:** \ **Category:** Unity\ **Tags:** ios, unity, csharp\ **Created:** [August 17, 2023, 9:26am UTC](https://qa.fmod.com/t/fmod-outputcoreaudio-suspend-cannot-start-audio-unit-err-561015905-ios/20556 "2023-08-17T09:26:02Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![a.petrov](https://avatars.discourse-cdn.com/v4/letter/a/c4cdca/32.png) [@a.petrov](https://qa.fmod.com/u/a.petrov)\ **Post date:** [August 17, 2023, 9:26am UTC](https://qa.fmod.com/t/fmod-outputcoreaudio-suspend-cannot-start-audio-unit-err-561015905-ios/20556/1 "2023-08-17T09:26:02Z")
If during the game, someone starts calling through instant messengers, for example Telegram, then when I return to the game, I get this error: [FMOD] OutputCoreAudio::suspend : Cannot start audio unit. (err: 561015905). [FMOD] System::mixerSuspend() returned ERR\_OUTPUT\_INIT for SYSTEM (0x136B14008) The errors is reproduced only on iOS Logs with stacktrace: [FMOD] OutputCoreAudio::suspend : Cannot start audio unit. (err: 561015905) 0 UnityFramework 0x000000010b2c5f28 \_ZdaPvRKSt9nothrow\_t + 3582556 1 UnityFramework 0x000000010b84c300 UnitySendMessage + 5790128 2 UnityFramework 0x000000010ae87860 MultiplyMatrixArrayWithBase4x4\_NEON + 53412 3 UnityFramework 0x000000010ae87754 MultiplyMatrixArrayWithBase4x4\_NEON + 53144 4 UnityFramework 0x000000010c52da2c UnityFramework + 36330028 5 UnityFramework 0x000000010a2be794 UnityFramework + 223124 6 UnityFramework 0x000000010c249dec FMOD5\_Reverb3D\_GetUserData + 384964 7 UnityFramework 0x000000010c284994 FMOD5\_Reverb3D\_GetUserData + 625516 8 UnityFramework 0x000000010c2a2acc FMOD5\_Reverb3D\_GetUserData + 748708 9 UnityFramework 0x000000010c299208 FMOD5\_Reverb3D\_GetUserData + 709600 10 UnityFramework 0x000000010a2be844 UnityFramework + 223300 11 UnityFramework 0x000000010a81a6f4 UnityFramework + 5842676 12 CoreFoundation 0x00000001aac5657c A900B459-0127-379E-9CBA-0EAB9C5D559F + 226684 13 CoreFoundation 0x00000001aacfa828 A900B459-0127-379E-9CBA-0EAB9C5D559F + 899112 14 CoreFoundation 0x00000001aacdd8b8 A900B459-0127-379E-9CBA-0EAB9C5D559F + 780472 15 CoreFoundation 0x00000001aac6aafc \_CFXNotificationPost + 700 16 Foundation 0x00000001a4f2dd18 1715DE5D-0893-3AF0-B0C0-550BB14F91EC + 380184 17 AudioSession 0x00000001c4960304 BFBF140A-DB1B-3B5B-ACE4-1C990763332A + 119556 18 libdispatch.dylib 0x00000001b20ee320 5D16936B-4E4C-3276-BA7A-69C9BC760ABA + 8992 19 libdispatch.dylib 0x00000001b20efeac 5D16936B-4E4C-3276-BA7A-69C9BC760ABA + 16044 20 libdispatch.dylib 0x00000001b20fe6a4 5D16936B-4E4C-3276-BA7A-69C9BC760ABA + 75428 21 libdispatch.dylib 0x00000001b20fe2f4 \_dispatch\_main\_queue\_callback\_4CF + 44 22 CoreFoundation 0x00000001aacb7c28 A900B459-0127-379E-9CBA-0EAB9C5D559F + 625704 23 CoreFoundation 0x00000001aac99560 A900B459-0127-379E-9CBA-0EAB9C5D559F + 501088 24 CoreFoundation 0x00000001aac9e3ec CFRunLoopRunSpecific + 612 25 GraphicsServices 0x00000001e61b435c GSEventRunModal + 164 26 UIKitCore 0x00000001ad02af58 7D57A1D1-856F-338D-97DB-880C4EC8B02E + 3788632 27 UIKitCore 0x00000001ad02abbc UIApplicationMain + 340 28 UnityFramework 0x000000010a29c0c8 UnityFramework + 82120 29 SimpleProject 0x0000000102ac7ccc SimpleProject + 31948 30 dyld 0x00000001ca1d0dec C3FC2EE4-367F-3086-BEB8-420AD442BF88 + 89580 * * * [FMOD] System::mixerSuspend() returned ERR\_OUTPUT\_INIT for SYSTEM (0x138A4C008). 0 UnityFramework 0x000000010b2c5f28 \_ZdaPvRKSt9nothrow\_t + 3582556 1 UnityFramework 0x000000010b84c300 UnitySendMessage + 5790128 2 UnityFramework 0x000000010ae87860 MultiplyMatrixArrayWithBase4x4\_NEON + 53412 3 UnityFramework 0x000000010ae87754 MultiplyMatrixArrayWithBase4x4\_NEON + 53144 4 UnityFramework 0x000000010c52ddd8 UnityFramework + 36330968 5 UnityFramework 0x000000010a2be7ec UnityFramework + 223212 6 UnityFramework 0x000000010c249e84 FMOD5\_Reverb3D\_GetUserData + 385116 7 UnityFramework 0x000000010c299258 FMOD5\_Reverb3D\_GetUserData + 709680 8 UnityFramework 0x000000010a2be844 UnityFramework + 223300 9 UnityFramework 0x000000010a81a6f4 UnityFramework + 5842676 10 CoreFoundation 0x00000001aac5657c A900B459-0127-379E-9CBA-0EAB9C5D559F + 226684 11 CoreFoundation 0x00000001aacfa828 A900B459-0127-379E-9CBA-0EAB9C5D559F + 899112 12 CoreFoundation 0x00000001aacdd8b8 A900B459-0127-379E-9CBA-0EAB9C5D559F + 780472 13 CoreFoundation 0x00000001aac6aafc \_CFXNotificationPost + 700 14 Foundation 0x00000001a4f2dd18 1715DE5D-0893-3AF0-B0C0-550BB14F91EC + 380184 15 AudioSession 0x00000001c4960304 BFBF140A-DB1B-3B5B-ACE4-1C990763332A + 119556 16 libdispatch.dylib 0x00000001b20ee320 5D16936B-4E4C-3276-BA7A-69C9BC760ABA + 8992 17 libdispatch.dylib 0x00000001b20efeac 5D16936B-4E4C-3276-BA7A-69C9BC760ABA + 16044 18 libdispatch.dylib 0x00000001b20fe6a4 5D16936B-4E4C-3276-BA7A-69C9BC760ABA + 75428 19 libdispatch.dylib 0x00000001b20fe2f4 \_dispatch\_main\_queue\_callback\_4CF + 44 20 CoreFoundation 0x00000001aacb7c28 A900B459-0127-379E-9CBA-0EAB9C5D559F + 625704 21 CoreFoundation 0x00000001aac99560 A900B459-0127-379E-9CBA-0EAB9C5D559F + 501088 22 CoreFoundation 0x00000001aac9e3ec CFRunLoopRunSpecific + 612 23 GraphicsServices 0x00000001e61b435c GSEventRunModal + 164 24 UIKitCore 0x00000001ad02af58 7D57A1D1-856F-338D-97DB-880C4EC8B02E + 3788632 25 UIKitCore 0x00000001ad02abbc UIApplicationMain + 340 26 UnityFramework 0x000000010a29c0c8 UnityFramework + 82120 27 SimpleProject 0x0000000102ac7ccc SimpleProject + 31948 28 dyld 0x00000001ca1d0dec C3FC2EE4-367F-3086-BEB8-420AD442BF88 + 89580 ---
**Author:** ![Connor\_FMOD](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/connor_fmod/32/3685_2.png) [@Connor\_FMOD](https://qa.fmod.com/u/Connor_FMOD)\ **Post date:** [August 18, 2023, 12:44am UTC](https://qa.fmod.com/t/fmod-outputcoreaudio-suspend-cannot-start-audio-unit-err-561015905-ios/20556/2 "2023-08-18T00:44:41Z")
Hi, Thank you for the logs. What version of FMOD and Unity are you using? ---
**Author:** ![a.petrov](https://avatars.discourse-cdn.com/v4/letter/a/c4cdca/32.png) [@a.petrov](https://qa.fmod.com/u/a.petrov)\ **Post date:** [August 18, 2023, 6:18am UTC](https://qa.fmod.com/t/fmod-outputcoreaudio-suspend-cannot-start-audio-unit-err-561015905-ios/20556/3 "2023-08-18T06:18:11Z")
Unity 2021.3.29f1 FMOD 2.02.15 ---
**Author:** ![Connor\_FMOD](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/connor_fmod/32/3685_2.png) [@Connor\_FMOD](https://qa.fmod.com/u/Connor_FMOD)\ **Post date:** [August 22, 2023, 4:33am UTC](https://qa.fmod.com/t/fmod-outputcoreaudio-suspend-cannot-start-audio-unit-err-561015905-ios/20556/4 "2023-08-22T04:33:30Z")
Hi, Thank you for the information. Unfortunately, while playing a single event and getting a Discord call I was not able to reproduce the issue. Do you have any custom background behaviors in Unity? Would it be possible to get a stripped-out version of the Unity project that is experiencing the issue [uploaded](https://fmod.com/profile#uploads) to your profile? Note, you will have to register a project with us to be able to upload. If not, could you elaborate on the set up of the project when the crash is occuring? Does it happen everytime?