embedded matlab function cause matlab stop

i use matlab 2015a and it was working fine, when i used embedded matlab function in simulink it cause matlab to stop and give error " matlab has encountered internal problem and needs to close " even when i use example from help

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	This segmentation violation occurred while executing the 
	S-function 'sf_sfun' in block 'e'.
	A common cause of this segmentation violation is an incorrect
	input port direct feedthrough setting. Each input port of the
	S-function that is read (accessed) in mdlOutputs and/or
	mdlGetTimeOfNextVarHit must specify that it needs its input
	signal in these routines by setting direct feedthrough for
	these input ports.
	Another cause can be incorrect memory accesses which occur
	when your code accesses beyond the end of an array. For example
	if you access input port 5 and in mdlInitializeSizes specify
	that you only have 4 input ports.
	To debug your C-MEX S-function, you can enable diagnostics
	by compiling the S-function source with the -g flag, e.g.,
	  mex -g sfunction_name.c