ios - exceptionPreprocess Unknown crash in app -

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hi app crashing randomly

please find solution here sending crash report.

0    corefoundation 0x24629fef __exceptionpreprocess + 127  1    libobjc.a.dylib 0x32f6dc8b objc_exception_throw + 36  2    corefoundation 0x2462f409 -[nsobject(nsobject) doesnotrecognizeselector:] + 186  3    corefoundation 0x2462d327 ___forwarding___ + 712  4    corefoundation 0x2455ce78 _cf_forwarding_prep_0 + 22  5    uikit 0x27cd8777 -[uiviewanimationstate actionforlayer:forkey:forview:] + 68  6    uikit 0x27ca1489 +[uiview(animation) _defaultuiviewactionforlayer:forkey:] + 86  7    uikit 0x27ca109d -[uiview(calayerdelegate) actionforlayer:forkey:] + 114  8    quartzcore 0x276b7487 -[calayer actionforkey:] + 144 9    quartzcore 0x276ad9f9 _zl12actionforkeyp7calayerpn2ca11transactionep8nsstring + 54  10   quartzcore 0x276ad8df _zn2ca5layer12begin_changeepns_11transactionejrp11objc_object + 128  11   quartzcore 0x276b0b5b _zn2ca5layer6setterej12_cavaluetypepkv + 176  12   quartzcore 0x276b73f1 -[calayer setopacity:] + 34  13   uikit 0x27ca0b0b -[uiview(rendering) setalpha:] + 112  14   mediaplayer 0x25ef4cf5 -[mpvolumeslider _layoutforavailableroutes] + 1302  15   mediaplayer 0x25f01db3 __59-[mpavroutingcontroller _schedulesenddelegaterouteschanged]_block_invoke + 120  16   libdispatch.dylib 0x334fe2e3 _dispatch_call_block_and_release + 8  17   libdispatch.dylib 0x334fe2cf _dispatch_client_callout + 20  18   libdispatch.dylib 0x33501d2f _dispatch_main_queue_callback_4cf + 1328  19   corefoundation 0x245ef609 __cfrunloop_is_servicing_the_main_dispatch_queue__ + 6  20   corefoundation 0x245edd09 __cfrunlooprun + 1510  21   corefoundation 0x2453a201 cfrunlooprunspecific + 474  22   corefoundation 0x2453a013 cfrunloopruninmode + 104  23   graphicsservices 0x2c00b201 gseventrunmodal + 134  24   uikit 0x27d06a09 uiapplicationmain + 1438  25   republichybridqa copy 0x000addbb main (main.m:17)  26   libdyld.dylib 0x3351faaf start + 0


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